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Voyager 1 and 2: The Interstellar Mission

An image of Neptune taken by the Voyager 2 spacecraft. Image credit: NASA

NASA has beautiful photos of every planet in our solar system. We even have images of faraway Neptune , as you can see in the photo above.

Neptune is much too distant for an astronaut to travel there with a camera. So, how do we have pictures from distant locations in our solar system? Our photographers were two spacecraft, called Voyager 1 and Voyager 2!

An artist’s rendering of one of the Voyager spacecraft. Image credit: NASA

The Voyager 1 and 2 spacecraft launched from Earth in 1977. Their mission was to explore Jupiter and Saturn —and beyond to the outer planets of our solar system. This was a big task. No human-made object had ever attempted a journey like that before.

The two spacecraft took tens of thousands of pictures of Jupiter and Saturn and their moons. The pictures from Voyager 1 and 2 allowed us to see lots of things for the first time. For example, they captured detailed photos of Jupiter's clouds and storms, and the structure of Saturn's rings .

Image of storms on Jupiter taken by the Voyager 1 spacecraft. Image credit: NASA

Voyager 1 and 2 also discovered active volcanoes on Jupiter's moon Io , and much more. Voyager 2 also took pictures of Uranus and Neptune. Together, the Voyager missions discovered 22 moons.

Since then, these spacecraft have continued to travel farther away from us. Voyager 1 and 2 are now so far away that they are in interstellar space —the region between the stars. No other spacecraft have ever flown this far away.

Where will Voyager go next?

Watch this video to find out what's beyond our solar system!

Both spacecraft are still sending information back to Earth. This data will help us learn about conditions in the distant solar system and interstellar space.

The Voyagers have enough fuel and power to operate until 2025 and beyond. Sometime after this they will not be able to communicate with Earth anymore. Unless something stops them, they will continue to travel on and on, passing other stars after many thousands of years.

Each Voyager spacecraft also carries a message. Both spacecraft carry a golden record with scenes and sounds from Earth. The records also contain music and greetings in different languages. So, if intelligent life ever find these spacecraft, they may learn something about Earth and us as well!

A photo of the golden record that was sent into space on both Voyager 1 and Voyager 2. Image credit: NASA/JPL-Caltech

More about our universe!

Where does interstellar space begin?

Searching for other planets like ours

Play Galactic Explorer!

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The remarkable twin Voyager spacecraft continue to explore the outer reaches of the solar system decades after they completed their surveys of the Outer Planets.  Launched in 1977 (September 5 for Voyager 1 (V1) and August 20 for Voyager 2 (V2), whose trajectory took it past Jupiter after Voyager 1), the spacecraft pair made many fundamental discoveries as they flew past Jupiter (March 1979 for V1, July 1979 for V2) and Saturn (November 1980 for V1, August 1981 for V2).  The path of Voyager 2 past Saturn was targeted so that it continued within the plane of the solar system, allowing it to become the first spacecraft to visit Uranus (January 1986) and Neptune (August 1989).  Following the Neptune encounter, both spacecraft started a new phase of exploration under the intriguing title of the Voyager Interstellar Mission.

Five instruments continue to collect important measurements of magnetic fields, plasmas, and charged particles as both spacecraft explore different portions of the solar system beyond the orbits of the planets.  Voyager 1 is now more than 118 astronomical units (one AU is equal to the average orbital distance of Earth from the Sun) distant from the sun, traveling at a speed (relative to the sun) of 17.1 kilometers per second (10.6 miles per second).  Voyager 2 is now more than 96 AU from the sun, traveling at a speed of 15.5 kilometers per second (9.6 miles per second).  Both spacecraft are moving considerably faster than Pioneers 10 and 11, two earlier spacecraft that became the first robotic visitors to fly past Jupiter and Saturn in the mid-70s.

This processed color image of Jupiter was produced in 1990 by the U.S. Geological Survey from a Voyager image captured in 1979. The colors have been enhanced to bring out detail. Zones of light-colored, ascending clouds alternate with bands of dark, descending clouds. The clouds travel around the planet in alternating eastward and westward belts at speeds of up to 540 kilometers per hour. Tremendous storms as big as Earthly continents surge around the planet. The Great Red Spot (oval shape toward the lower-left) is an enormous anticyclonic storm that drifts along its belt, eventually circling the entire planet.

As seen in the night sky at Earth, Voyager 1 is within the confines of the constellation Ophiuchus, only slightly above the celestial equator; no telescope can see it, but radio contact is expected to be maintained for at least the next ten years.  Voyager 2 is within the bounds of the constellation Telescopium (which somehow sounds quite appropriate) in the far southern night sky.

Both spacecraft have already passed something called the Termination Shock † (December 2004 for V1, August 2007 for V2), where the solar wind slows as it starts to interact with the particles and fields present between the stars.  It is expected that both spacecraft will encounter the Heliopause, where the solar wind ceases as true interstellar space begins, from 10 to 20 years after crossing the Termination Shock.  Theories exist for what should be present in interstellar space, but the Voyagers will become the first man-made objects to go beyond the influences of the Sun, hopefully returning the first measurements of what it is like out there.  Each spacecraft is carrying a metal record with encoded sounds and sights from Earth, along with the needle needed to read the recordings, and simplified instructions for where the spacecraft came from, in case they are eventually discovered by intelligent extra-terrestrials.

Keep track of the Voyager spacecraft on the official  Voyager Interstellar Mission website or follow  @NASAVoyager2 on Twitter.    † The sun ejects a continuous stream of charged particles (electrons, protons, etc) that is collectively termed the solar wind.  The particles are traveling extremely fast and are dense enough to form a very tenuous atmosphere; the heliosphere represents the volume of space where the effects of the solar wind dominate over those of particles in interstellar space.  The solar wind particles are moving very much faster than the local speed of sound represented by their low volume density.  When the particles begin to interact with interstellar particles and fields (the interaction can be either physically running into other particles or experiencing an electromagnetic force resulting from a charged particle moving within a magnetic field), then they start to slow down.  The point at which they become subsonic (rather than their normal hypersonic speed) is the Termination Shock.

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Voyager 1 Trajectory through the Solar System

Visualization centered on the Voyager 1 trajectory through the solar system.

A slightly sped-up version of the Voyager 1 visualization above, reducing the time for the Voyagers to cross the asteroid belt.

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Voyager Of The Seas

Royal caribbean.

• Year of built 1999
• Length (LOA) 311 m / 1020 ft
• Passengers 4099
• Destination LIVORNO
• ETA June 7, 04:00
• Speed 19 kn / 35 km/h
• Temperature

Voyager 1 Sends Clear Data to NASA for the First Time in Five Months

The farthest spacecraft from Earth had been transmitting nonsense since November, but after an engineering tweak, it finally beamed back a report on its health and status

Will Sullivan

Daily Correspondent

For the first time in five months, NASA has received usable data from Voyager 1, the farthest spacecraft from Earth.

The aging probe, which has traveled more than 15 billion miles into space, stopped transmitting science and engineering data on November 14. Instead, it sent NASA a nonsensical stream of repetitive binary code . For months, the agency’s engineers undertook a slow process of trial and error, giving the spacecraft various commands and waiting to see how it responded. Thanks to some creative thinking, the team identified a broken chip on the spacecraft and relocated some of the code that was stored there, according to the agency .

NASA is now receiving data about the health and status of Voyager 1’s engineering systems. The next step is to get the spacecraft to start sending science data again.

“Today was a great day for Voyager 1,” Linda Spilker , a Voyager project scientist at NASA’s Jet Propulsion Laboratory (JPL), said in a statement over the weekend, per CNN ’s Ashley Strickland. “We’re back in communication with the spacecraft. And we look forward to getting science data back.”

Hi, it's me. - V1 https://t.co/jgGFBfxIOe — NASA Voyager (@NASAVoyager) April 22, 2024

Voyager 1 and its companion, Voyager 2, separately launched from Earth in 1977. Between the two of them, the probes have studied all four giant planets in the outer solar system—Jupiter, Saturn, Uranus and Neptune—along with 48 of their moons and the planets’ magnetic fields. The spacecraft observed Saturn’s rings in detail and discovered active volcanoes on Jupiter’s moon Io .

Originally designed for a five-year mission within our solar system, both probes are still operational and chugging along through space, far beyond Pluto’s orbit. In 2012, Voyager 1 became the first human-made object to reach interstellar space, the area between stars. The probe is now about eight times farther from the sun than Uranus is on average.

Over the decades, the Voyager spacecraft have transmitted data collected on their travels back to NASA scientists. But in November, Voyager 1 started sending gibberish .

Engineers determined Voyager 1’s issue was with one of three onboard computers, called the flight data system (FDS), NASA said in a December blog post . While the spacecraft was still receiving and executing commands from Earth, the FDS was not communicating properly with a subsystem called the telemetry modulation unit (TMU). The FDS collects science and engineering data and combines it into a package that the TMU transmits back to Earth.

Since Voyager 1 is so far away, testing solutions to its technical issues requires time—it takes 22.5 hours for commands to reach the probe and another 22.5 hours for Voyager 1’s response to come back.

On March 1, engineers sent a command that coaxed Voyager 1 into sending a readout of the FDS memory, NASA said in a March 13 blog post . From that readout, the team confirmed a small part—about 3 percent—of the system’s memory had been corrupted, NASA said in an April 4 update .

The core of the problem turned out to be a faulty chip hosting some software code and part of the FDS memory. NASA doesn’t know what caused the chip to stop working—it could be that a high-energy particle from space collided with it, or the chip might have just run out of steam after almost 50 years spent hurtling through the cosmos.

“It’s the most serious issue we’ve had since I’ve been the project manager, and it’s scary because you lose communication with the spacecraft,” Suzanne Dodd , Voyager project manager at JPL, told Scientific American ’s Nadia Drake in March.

To receive usable data again, the engineers needed to move the affected code somewhere else that wasn’t broken. But no single location in the FDS memory was large enough to hold all of the code, so the engineers divided it into chunks and stored it in multiple places, per NASA .

The team started with moving the code responsible for sending Voyager’s status reports, sending it to its new location in the FDS memory on April 18. They received confirmation that the strategy worked on April 20, when the first data on the spacecraft’s health since November arrived on Earth.

In the next several weeks, the team will relocate the parts of the FDS software that can start returning science data.

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Will Sullivan | | READ MORE

Will Sullivan is a science writer based in Washington, D.C. His work has appeared in Inside Science and NOVA Next .

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ForeFlight Voyager is your first-class ticket to airport exploration in the era of spatial computing! Whether you’re planning your next flight or dreaming of the perfect getaway, Voyager transports you to airports near and far with a stunning 3D view and live traffic display.

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The Ultimate Playground for Aviation Enthusiasts

Embark on a journey like never before with ForeFlight Voyager. Tailored for the aviation enthusiast in all of us, Voyager is a free app that gives you a front-row seat at the busiest airports around the world. Whether you're planning for an upcoming flight, recalling past ones, or just plane watching from the comfort of your living room, Voyager takes you to airports near and far with stunning 3D views and live traffic displays.

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Join your friends on voyages to new airports via Voyager's SharePlay support! After joining a FaceTime call with others using Vision Pro, access the SharePlay menu just below Voyager’s airport panel and start sharing with others. Collaboratively explore and interact within the same airport environment by zooming, panning, and rotating the disk.

Air Traffic Radio

Access live radio communications at supported airports with the new LiveATC integration. Simply tap the tower button while viewing a supported airport to activate the radio. Select any frequency by tapping it. Live listener counts for each frequency are also displayed in the frequency list.

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View an airport from any angle without moving your feet with new support for rotating Voyager’s disk. Rotate the disk in Voyager by grabbing it with both hands and moving in your desired direction, with visual aids like 15° tick marks and an N for North to guide your orientation. You can also zoom the map in and out with two hands, rotate the map while zooming, and pan the map up to 15 miles away from the airport.

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Combining satellite imagery with high-resolution terrain data, Voyager dynamically generates 3D depictions of airports and their surroundings directly in front of you. Explore airports from any angle and quickly access real-time weather conditions and location information.

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Voyager goes beyond static maps by providing real-time insight into air traffic near an airport. Experience interactive visuals of various aircraft types at their true, to-scale altitudes, complete with realistic pitch and bank angles.

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Tap on any aircraft in the 3D environment to access detailed information, including its flight plan, aircraft type, and live speed, altitude, and heading indicators. Gain a front-row perspective on the skies as you stay informed about the real-time dynamics of each aircraft. 

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Choose from Featured Airports or sort by proximity and search for any airport using name, identifier, or city. Save favorites for quick access or revisit recently viewed airports. Voyager ensures straightforward exploration tailored to your preferences.

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Things are finally looking up for the Voyager 1 interstellar spacecraft

Two of the four science instruments aboard the Voyager 1 spacecraft are now returning usable data after months of transmitting only gibberish, NASA scientists have announced.

I was once sitting with my father while Googling how far away various things in the solar system are from Earth. He was looking for exact numbers, and very obviously grew more invested with each new figure I shouted out. I was thrilled. The moon? On average, 238,855 miles (384,400 kilometers) away. The James Webb Space Telescope ? Bump that up to about a million miles (1,609,344 km) away. The sun? 93 million miles (149,668,992 km) away.  Neptune ? 2.8  billion  miles (4.5 billion km) away. "Well, wait until you hear about Voyager 1," I eventually said, assuming he was aware of what was coming. He was not.

"NASA's  Voyager 1  interstellar spacecraft actually isn't even in the solar system anymore," I announced. "Nope, it's more than 15 billion miles (24 billion km)  away from us  — and it's getting even farther as we speak." I can't quite remember his response, but I do indeed recall an expression of sheer disbelief. There were immediate inquiries about how that's even physically possible. There were bewildered laughs, different ways of saying "wow," and mostly, there was a contagious sense of awe. And just like that, a new Voyager 1 fan was born.

It is easy to see why Voyager 1 is among the most beloved robotic space explorers we have — and it is thus easy to understand why so many people felt a pang to their hearts several months ago, when Voyager 1 stopped talking to us.

Related:  After months of sending gibberish to NASA, Voyager 1 is finally making sense again

For reasons unknown at the time, this spacecraft began sending back gibberish in place of the neatly organized and data-rich 0's and 1's it had been providing since its  launch in 1977 . It was this classic computer language which allowed Voyager 1 to converse with its creators while earning the title of "farthest human made object." It's how the spacecraft relayed vital insight that led to the discovery of new Jovian moons and, thanks to this sort of binary podcast, scientists incredibly identified a new ring of Saturn and created the solar system's first and only "family portrait." This code, in essence, is crucial to Voyager 1's very being.

Plus, to make matters worse, the issue behind the glitch turned out to be associated with the craft's Flight Data System, which is literally the system that transmits information about Voyager 1's health so scientists can correct any issues that arise. Issues like this one. Furthermore, because of the spacecraft's immense distance from its operators on Earth, it takes about 22.5 hours for a transmission to reach the spacecraft, and then 22.5 hours to receive a transmission back. Alas, things weren't looking good for a while — for about five months, to be precise.

But then, on April 20, Voyager 1  finally phoned home  with legible 0's and legible 1's.

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"The team had gathered early on a weekend morning to see whether telemetry would return," Bob Rasmussen, a member of the Voyager flight team, told Space.com. "It was nice to have everyone assembled in one place like this to share in the moment of learning that our efforts had been successful. Our cheer was both for the intrepid spacecraft and for the comradery that enabled its recovery."

And  then,  on May 22 , Voyager scientists released the welcome announcement that the spacecraft has successfully resumed returning science data from two of its four instruments, the plasma wave subsystem and magnetometer instrument. They're now working on getting the other two, the cosmic ray subsystem and low energy charged particle instrument, back online as well. Though there technically are six other instruments onboard Voyager, those had been out of commission for some time.

The comeback

Rasmussen was actually a member of the Voyager team in the 1970s, having worked on the project as a computer engineer before leaving for other missions including  Cassini , which launched the spacecraft that taught us almost everything we currently know about Saturn. In 2022, however, he returned to Voyager because of a separate dilemma with the mission — and has remained on the team ever since.

"There are many of the original people who were there when Voyager launched, or even before, who were part of both the flight team and the science team," Linda Spilker, a planetary scientist at NASA's Jet Propulsion Laboratory , who also worked on the Voyager mission, told Space.com in the This Week from Space podcast on the TWiT network. "It's a real tribute to Voyager — the longevity not only of the spacecraft, but of the people on the team."

To get Voyager 1 back online, in rather cinematic fashion, the team devised a complex workaround that prompted the FDS to send a copy of its memory back to Earth. Within that memory readout, operators managed to discover the crux of the problem — a corrupted code spanning a single chip — which was then remedied through another (honestly,  super interesting ) process to modify the code. On the day Voyager 1 finally spoke again, "you could have heard a pin drop in the room," Spilker said. "It was very silent. Everybody's looking at the screen, waiting and watching." 

Of course, Spilker also brought in some peanuts for the team to munch on — but not just any peanuts. Lucky peanuts. 

It's a longstanding tradition at JPL to have a peanut feast before major mission events like launches, milestones and, well, the possible resurrection of Voyager 1. It  began  in the 1960s, when the agency was trying to launch the Ranger 7 mission that was meant to take pictures of and collect data about the moon's surface. Rangers 1 through 6 had all failed, so Ranger 7 was a big deal. As such, the mission's trajectory engineer, Dick Wallace, brought lots of peanuts for the team to nibble on and relax. Sure enough, Ranger 7 was a success and, as Wallace once said, "the rest is history." 

Voyager 1 needed some of those positive snacky vibes. 

"It'd been five months since we'd had any information," Spilker explained. So, in this room of silence besides peanut-eating-noises, Voyager 1 operators sat at their respective system screens, waiting. 

"All of a sudden it started to populate — the data," Spilker said. That's when the programmers who had been staring at those screens in anticipation leapt out of their seats and began to cheer: "They were the happiest people in the room, I think, and there was just a sense of joy that we had Voyager 1 back."

Eventually, Rasmussen says the team was able to conclude that the failure probably occurred due to a combination of aging and radiation damage by which energetic particles in space bombarded the craft. This is also why he believes it wouldn't be terribly surprising to see a similar failure occur in the future, seeing as Voyager 1 is still roaming beyond the distant boundaries of our stellar neighborhood just like its spacecraft twin,  Voyager 2 .

To be sure, the spacecraft isn't fully fixed yet — but it's lovely to know things are finally looking up, especially with the recent news that some of its science instruments are back on track. And, at the very least, Rasmussen assures that nothing the team has learned so far has been alarming. "We're confident that we understand the problem well," he said, "and we remain optimistic about getting everything back to normal — but we also expect this won't be the last."

In fact, as Rasmussen explains, Voyager 1 operators first became optimistic about the situation just after the root cause of the glitch had been determined with certainty. He also emphasizes that the team's spirits were never down. "We knew from indirect evidence that we had a spacecraft that was mostly healthy," he said. "Saying goodbye was not on our minds."

"Rather," he continued, "we wanted to push toward a solution as quickly as possible so other matters on board that had been neglected for months could be addressed. We're now calmly moving toward that goal."

The future of Voyager's voyage

It can't be ignored that, over the last few months, there has been an air of anxiety and fear across the public sphere that Voyager 1 was slowly moving toward sending us its final 0 and final 1. Headlines all over the internet, one written by  myself included , have carried clear, negative weight. I think it's because even if Voyager 2 could technically carry the interstellar torch post-Voyager 1, the prospect of losing Voyager 1 felt like the prospect of losing a piece of history. 

"We've crossed this boundary called the heliopause," Spilker explained of the Voyagers. "Voyager 1 crossed this boundary in 2012; Voyager 2 crossed it in 2018 — and, since that time, were the first spacecraft ever to make direct measurements of the interstellar medium." That medium basically refers to material that fills the space between stars. In this case, that's the space between other stars and our sun, which, though we don't always think of it as one, is simply another star in the universe. A drop in the cosmic ocean.

"JPL started building the two Voyager spacecraft in 1972," Spilker explained. "For context, that was only three years after we had the first human walk on the moon — and the reason we started that early is that we had this rare alignment of the planets that happens once every  176 years ." It was this alignment that could promise the spacecraft checkpoints across the solar system, including at Jupiter, Saturn, Uranus and Neptune. Those checkpoints were important for the Voyagers in particular. Alongside planetary visits come gravity assists, and gravity assists can help fling stuff within the solar system — and, now we know, beyond.

As the first humanmade object to leave the solar system, as a relic of America's early space program, and as a testament to how robust even decades-old technology can be, Voyager 1 has carved out the kind of legacy usually reserved for remarkable things lost to time.

"Our scientists are eager to see what they’ve been missing," Rasmussen remarked. "Everyone on the team is self-motivated by their commitment to this unique and important project. That's where the real pressure comes from." 

Still, in terms of energy, the team's approach has been clinical and determined. 

— NASA's Voyager 1 sends readable message to Earth after 4 nail-biting months of gibberish

— NASA engineers discover why Voyager 1 is sending a stream of gibberish from outside our solar system

— NASA's Voyager 1 probe hasn't 'spoken' in 3 months and needs a 'miracle' to save it

"No one was ever especially excited or depressed," he said. "We're confident that we can get back to business as usual soon, but we also know that we're dealing with an aging spacecraft that is bound to have trouble again in the future. That's just a fact of life on this mission, so not worth getting worked up about."

Nonetheless, I imagine it's always a delight for Voyager 1's engineers to remember this robotic explorer occupies curious minds around the globe. (Including my dad's mind now, thanks to me and Google.)

As Rasmussen puts it: "It's wonderful to know how much the world appreciates this mission."

Originally posted on Space.com .

Monisha Ravisetti is Space.com's Astronomy Editor. She covers black holes, star explosions, gravitational waves, exoplanet discoveries and other enigmas hidden across the fabric of space and time. Previously, she was a science writer at CNET, and before that, reported for The Academic Times. Prior to becoming a writer, she was an immunology researcher at Weill Cornell Medical Center in New York. She graduated from New York University in 2018 with a B.A. in philosophy, physics and chemistry. She spends too much time playing online chess. Her favorite planet is Earth.

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Bolivian Scientists to Track Glacial Changes at High Speed With New Equipment

FILE PHOTO: The Huayna Potosi mountain is seen without its glaciers and with little snow, in Milluni, near El Alto outskirts of La Paz, Bolivia, December 21, 2020. Picture taken December 21, 2020. REUTERS/David Mercado

LA PAZ (Reuters) - Scientists in Bolivia are hoping to track glacial changes at lightning speed.

New scientific equipment being installed at the country's Huayna Potosi mountain peak will provide real-time measurements of glaciers' mass compared to much slower older methods.

Edson Ramirez, a glaciologist at Bolivia's Higher University of San Andres, said the equipment could make hourly measurements of glacial mass compared to classic glacialogy methods capable of monthly or yearly readings.

"This time we are doing it in a very short time and in real time," Ramirez said.

The measurements could help measure melting rates or how much life is still left for a glacier, he added.

Glaciers play a significant role in water supply across the Andes mountain range, with studies showing they provide around 27% of the water in Bolivia's Cordillera Real region in the dry season.

Extreme weather events like heat waves and droughts have stressed water supplies throughout South America, making more accurate glacier measurements a critical tool.

"You can't take measures or prepare yourself for the future if you don't know where you are," said Gerd Dercon, head of the soil, water management and crop nutrition laboratory at the joint FAO/IAEA Centre of Nuclear Techniques in Food and Agriculture.

Dercon said the measurements would help create a baseline.

"From that baseline you can take actions," he said, such as improving reservoir capacity, adjusting the course of water or building more reservoirs.

(Reporting by Monica Machiaco; Writing by Alexander Villegas; Editing by Jamie Freed)

Copyright 2024 Thomson Reuters .

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Tags: environment , Bolivia , water , South America

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First to visit all four giant planets

Voyager 2 is the only spacecraft to visit Uranus and Neptune. The probe is now in interstellar space, the region outside the heliopause, or the bubble of energetic particles and magnetic fields from the Sun.

Mission Type

What is Voyager 2?

NASA's Voyager 2 is the second spacecraft to enter interstellar space. On Dec. 10, 2018, the spacecraft joined its twin – Voyager 1 – as the only human-made objects to enter the space between the stars.

• Voyager 2 is the only spacecraft to study all four of the solar system's giant planets at close range.
• Voyager 2 discovered a 14th moon at Jupiter.
• Voyager 2 was the first human-made object to fly past Uranus.
• At Uranus, Voyager 2 discovered 10 new moons and two new rings.
• Voyager 2 was the first human-made object to fly by Neptune.
• At Neptune, Voyager 2 discovered five moons, four rings, and a "Great Dark Spot."

In Depth: Voyager 2

The two-spacecraft Voyager missions were designed to replace original plans for a “Grand Tour” of the planets that would have used four highly complex spacecraft to explore the five outer planets during the late 1970s.

NASA canceled the plan in January 1972 largely due to anticipated costs (projected at $1 billion) and instead proposed to launch only two spacecraft in 1977 to Jupiter and Saturn. The two spacecraft were designed to explore the two gas giants in more detail than the two Pioneers (Pioneers 10 and 11) that preceded them.

In 1974, mission planners proposed a mission in which, if the first Voyager was successful, the second one could be redirected to Uranus and then Neptune using gravity assist maneuvers.

Each of the two spacecraft was equipped with a slow-scan color TV camera to take images of the planets and their moons and each also carried an extensive suite of instruments to record magnetic, atmospheric, lunar, and other data about the planetary systems.

The design of the two spacecraft was based on the older Mariners, and they were known as Mariner 11 and Mariner 12 until March 7, 1977, when NASA Administrator James C. Fletcher (1919-1991) announced that they would be renamed Voyager.

Power was provided by three plutonium oxide radioisotope thermoelectric generators (RTGs) mounted at the end of a boom.

Voyager 2 at Jupiter

Voyager 2 began transmitting images of Jupiter April 24, 1979, for time-lapse movies of atmospheric circulation. Unlike Voyager 1, Voyager 2 made close passes to the Jovian moons on its way into the system, with scientists especially interested in more information from Europa and Io (which necessitated a 10 hour-long “volcano watch”).

During its encounter, it relayed back spectacular photos of the entire Jovian system, including its moons Callisto, Ganymede, Europa (at a range of about 127,830 miles or 205,720 kilometers, much closer than Voyager 1), Io, and Amalthea, all of which had already been surveyed by Voyager 1.

Voyager 2’s closest encounter to Jupiter was at 22:29 UT July 9, 1979, at a range of about 400,785 miles (645,000 kilometers). It transmitted new data on the planet’s clouds, its newly discovered four moons, and ring system as well as 17,000 new pictures.

When the earlier Pioneers flew by Jupiter, they detected few atmospheric changes from one encounter to the second, but Voyager 2 detected many significant changes, including a drift in the Great Red Spot as well as changes in its shape and color.

With the combined cameras of the two Voyagers, at least 80% of the surfaces of Ganymede and Callisto were mapped out to a resolution of about 3 miles (5 kilometers).

Voyager 2 at Saturn

Following a course correction two hours after its closest approach to Jupiter, Voyager 2 sped to Saturn, its trajectory determined to a large degree by a decision made in January 1981, to try to send the spacecraft to Uranus and Neptune later in the decade.

Its encounter with the sixth planet began Aug. 22, 1981, two years after leaving the Jovian system, with imaging of the moon Iapetus. Once again, Voyager 2 repeated the photographic mission of its predecessor, although it actually flew about 14,290 miles (23,000 kilometers) closer to Saturn. The closest encounter to Saturn was at 01:21 UT Aug. 26, 1981, at a range of about 63,000 miles (101,000 kilometers).

The spacecraft provided more detailed images of the ring “spokes” and kinks, and also the F-ring and its shepherding moons, all found by Voyager 1. Voyager 2’s data suggested that Saturn’s A-ring was perhaps only about 980 feet (300 meters) thick.

As it flew behind and up past Saturn, the probe passed through the plane of Saturn’s rings at a speed of 8 miles per second (13 kilometers per second). For several minutes during this phase, the spacecraft was hit by thousands of micron-sized dust grains that created “puff” plasma as they were vaporized. Because the vehicle’s attitude was repeatedly shifted by the particles, attitude control jets automatically fired many times to stabilize the vehicle.

During the encounter, Voyager 2 also photographed the Saturn moons Hyperion (the “hamburger moon”), Enceladus, Tethys, and Phoebe as well as the more recently discovered Helene, Telesto and Calypso.

Voyager 2 at Uranus

Although Voyager 2 had fulfilled its primary mission goals with the two planetary encounters, mission planners directed the veteran spacecraft to Uranus—a journey that would take about 4.5 years.

In fact, its encounter with Jupiter was optimized in part to ensure that future planetary flybys would be possible.

The Uranus encounter’s geometry was also defined by the possibility of a future encounter with Neptune: Voyager 2 had only 5.5 hours of close study during its flyby.

Voyager 2 was the first human-made object to fly past the planet Uranus.

Long-range observations of the planet began Nov. 4, 1985, when signals took approximately 2.5 hours to reach Earth. Light conditions were 400 times less than terrestrial conditions. Closest approach to Uranus took place at 17:59 UT Jan. 24, 1986, at a range of about 50,640 miles (81,500 kilometers).

During its flyby, Voyager 2 discovered 10 new moons (given such names as Puck, Portia, Juliet, Cressida, Rosalind, Belinda, Desdemona, Cordelia, Ophelia, and Bianca -- obvious allusions to Shakespeare), two new rings in addition to the “older” nine rings, and a magnetic field tilted at 55 degrees off-axis and off-center.

The spacecraft found wind speeds in Uranus’ atmosphere as high as 450 miles per hour (724 kilometers per hour) and found evidence of a boiling ocean of water some 497 miles (800 kilometers) below the top cloud surface. Its rings were found to be extremely variable in thickness and opacity.

Voyager 2 also returned spectacular photos of Miranda, Oberon, Ariel, Umbriel, and Titania, five of Uranus’ larger moons. In flying by Miranda at a range of only 17,560 miles (28,260 kilometers), the spacecraft came closest to any object so far in its nearly decade-long travels. Images of the moon showed a strange object whose surface was a mishmash of peculiar features that seemed to have no rhyme or reason. Uranus itself appeared generally featureless.

The spectacular news of the Uranus encounter was interrupted the same week by the tragic Challenger accident that killed seven astronauts during their space shuttle launch Jan. 28, 1986.

Voyager 2 at Neptune

Following the Uranus encounter, the spacecraft performed a single midcourse correction Feb. 14, 1986—the largest ever made by Voyager 2—to set it on a precise course to Neptune.

Voyager 2’s encounter with Neptune capped a 4.3 billion-mile (7 billion-kilometer) journey when, on Aug. 25, 1989, at 03:56 UT, it flew about 2,980 miles (4,800 kilometers) over the cloud tops of the giant planet, the closest of its four flybys. It was the first human-made object to fly by the planet. Its 10 instruments were still in working order at the time.

During the encounter, the spacecraft discovered six new moons (Proteus, Larissa, Despina, Galatea, Thalassa, and Naiad) and four new rings.

The planet itself was found to be more active than previously believed, with 680-mile (1,100-kilometer) per hour winds. Hydrogen was found to be the most common atmospheric element, although the abundant methane gave the planet its blue appearance.

Images revealed details of the three major features in the planetary clouds—the Lesser Dark Spot, the Great Dark Spot, and Scooter.

Voyager photographed two-thirds of Neptune’s largest moon Triton, revealing the coldest known planetary body in the solar system and a nitrogen ice “volcano” on its surface. Spectacular images of its southern hemisphere showed a strange, pitted cantaloupe-type terrain.

The flyby of Neptune concluded Voyager 2’s planetary encounters, which spanned an amazing 12 years in deep space, virtually accomplishing the originally planned “Grand Tour” of the solar system, at least in terms of targets reached if not in science accomplished.

Voyager 2's Interstellar Mission

Once past the Neptune system, Voyager 2 followed a course below the ecliptic plane and out of the solar system. Approximately 35 million miles (56 million kilometers) past the encounter, Voyager 2’s instruments were put in low power mode to conserve energy.

After the Neptune encounter, NASA formally renamed the entire project the Voyager Interstellar Mission (VIM).

Of the four spacecraft sent out to beyond the environs of the solar system in the 1970s, three of them -- Voyagers 1 and 2 and Pioneer 11 -- were all heading in the direction of the solar apex, i.e., the apparent direction of the Sun’s travel in the Milky Way galaxy, and thus would be expected to reach the heliopause earlier than Pioneer 10 which was headed in the direction of the heliospheric tail.

In November 1998, 21 years after launch, nonessential instruments were permanently turned off, leaving seven instruments still operating.

At 9.6 miles per second (15.4 kilometers per second) relative to the Sun, it will take about 19,390 years for Voyager 2 to traverse a single light year.

Asif Siddiqi

Beyond Earth: A Chronicle of Deep Space Exploration

Through the turn of the century, NASA's Jet Propulsion Laboratory (JPL) continued to receive ultraviolet and particle fields data. For example, on Jan. 12, 2001, an immense shock wave that had blasted out of the outer heliosphere on July 14, 2000, finally reached Voyager 2. During its six-month journey, the shock wave had plowed through the solar wind, sweeping up and accelerating charged particles. The spacecraft provided important information on high-energy shock-energized ions.

On Aug. 30, 2007, Voyager 2 passed the termination shock and then entered the heliosheath. By Nov. 5, 2017, the spacecraft was 116.167 AU (about 10.8 billion miles or about 17.378 billion kilometers) from Earth, moving at a velocity of 9.6 miles per second (15.4 kilometers per second) relative to the Sun, heading in the direction of the constellation Telescopium. At this velocity, it would take about 19,390 years to traverse a single light-year.

On July 8, 2019, Voyager 2 successfully fired up its trajectory correction maneuver thrusters and will be using them to control the pointing of the spacecraft for the foreseeable future. Voyager 2 last used those thrusters during its encounter with Neptune in 1989.

The spacecraft's aging attitude control thrusters have been experiencing degradation that required them to fire an increasing and untenable number of pulses to keep the spacecraft's antenna pointed at Earth. Voyager 1 had switched to its trajectory correction maneuver thrusters for the same reason in January 2018.

To ensure that both vintage robots continue to return the best scientific data possible from the frontiers of space, mission engineers are implementing a new plan to manage them. The plan involves making difficult choices, particularly about instruments and thrusters.

National Space Science Data Center: Voyager 2

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Voyager 2 position calculator.

Compute the position of Voyager 2 for any date and time between 1 January 2013 and 30 December 2099 and visualize the results on an interactive sky map.

Voyager 2 is currently in the constellation of Pavo , at a distance of 20,355,874,724 kilometers from Earth. The current Right Ascension of Voyager 2 is 20h 12m 46s and the Declination is -59° 16’ 05” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom ).

Voyager 2 is an unmanned space probe launched by NASA on August 20, 1977, just a few weeks before its sister craft Voyager 1. Its mission was to study the outer planets of our solar system, including Jupiter, Saturn, Uranus, and Neptune. It was the first and only spacecraft to visit all four planets, and its observations revolutionized our understanding of these distant worlds. After completing its primary mission, Voyager 2 continued on its journey into interstellar space, where it is still sending back data on the interstellar medium and the heliosphere. Voyager 2 is currently the second most distant human-made object from Earth, after its sister craft Voyager 1, and continues to be in communication with NASA's Deep Space Network.

Today's rise, transit and set times of Voyager 2 from Greenwich, United Kingdom (all times relative to the local timezone Europe/London):

Today Voyager 2 is not visible from Greenwich, United Kingdom

• Voyager 2 is below the horizon from Greenwich, United Kingdom .
• Go to interactive sky chart

If you need to access this information frequently for your observations, you can create a simple customized Quick Access page , so that you can easily bookmark it in your browser favorites or add a shortcut to your mobile phones' home screen.

• Position and finder charts (see also Where is Voyager 2? )
• Distance from Earth (see also How far is Voyager 2 from Earth? )
• When does Voyager 2 rise and set?
• Interactive orbit visualization . 3d visualization showing the orbit of Voyager 2 with respect to the major Solar System objects.
• 15 days ephemerides . Table showing celestial coordinates and magnitude of Voyager 2 for the past and next 7 days.
• Interactive sky chart . An online planetarium application that shows where to locate Voyager 2 in the sky from your location.
• Live position tracker . A high precision sky chart that uses real deep sky imagery to help locate Voyager 2 with your telescope or on your astrophotographies.

Voyager 2 Position and Finder Charts

Higher precision deep sky finder chart, 60 arcmin wide, showing where Voyager 2 is right now. Click on the image to see a more detailed fullscreen tracker view .

Also check out Where is Voyager 2? , a page that provides all the information needed to find Voyager 2 in the sky and additional links to sky charts.

Voyager 2 Distance from Earth

The distance of Voyager 2 from Earth is currently 20,355,874,724 kilometers, equivalent to 136.070618 Astronomical Units . Light takes 18 hours, 51 minutes and 39.8893 seconds to travel from Voyager 2 and arrive to us.

The following chart shows the distance of Voyager 2 from Earth as a function of time. In the chart the distance data is measured in Astronomical Units and sampled with an interval of 1 day.

Closest Approach of Voyager 2 to Earth

NOTE: values for the closest approach are computed with a sampling interval of 1 day.

Visualization of Voyager 2 Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Voyager 2 with respect of the Sun and the orbits of the major planets . The position of Voyager 2 and the planets along their orbits in this diagram accurately represents the current configuration of the objects in the Solar System. This is an experimental feature and it requires a WebGL enabled browser. Please provide us feedback !

Voyager 2 15 Days Ephemeris

The following table lists the ephemerides of Voyager 2 computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Voyager 2 in our Online Planetarium at the chosen date.

Voyager 2 Ephemeris Calculator

Compute the position of Voyager 2 for any date and time between 1 January 2013 and 30 December 2099 and display the results on an interactive star map.

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ELECTION 2024: Wendell Felder clinches Democratic nomination for Ward 7 DC Council seat

‘We can’t turn our back on rising sea levels’: New Md. sensors measure flooding in real time

John Domen | [email protected]

June 6, 2024, 9:29 AM

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Hanging on a pilon along Ego Alley in Annapolis, Maryland, is what looks like a piece of PVC pipe with a small solar panel attached to it. There are more of them hanging around the city, and soon they’ll be up and down Anne Arundel County, as well as in Charles County, Baltimore City and throughout the Eastern Shore.

The new sensors, called the “Maryland HydroNet” and installed by the University of Maryland , will help local governments as well as those who live in flood prone areas track rising floodwaters in real time.

While the federal government already has instruments monitoring water levels, those sensors are extremely expensive, in the range of hundreds of thousands of dollars. These much more inexpensive local ones will help add to the information they collect.

Because they’re so much cheaper — though not as precise as the ones the National Oceanic and Atmospheric Administration uses — scientists will be able to install more of them all over the place, including smaller communities that get hit hard by flooding but have limited economic resources.

The Maryland HydroNet uses technology from a Hawaiian-based company called Hohonu. It’s CEO and founder is Brian Glazer, who is also a professor at the University of Hawaii.

“That’s the magic, making it cheap and easy and able to put out anywhere,” Glazer told community members gathered on the Annapolis City Dock on Wednesday morning. “The gray cone at the bottom is pinging, looking down at the water like a dolphin or a bat using sonar, and measuring that air gap distance. So as water comes up, or water goes down, it’s measuring that every second.”

Each sensor and the data support that comes with it costs less than $3,000 per year, and it can provide the sort of hyperlocal monitoring that was previously impossible to get. The sensor is now being used in 15 states around the country.

“It means mayors are waking up at 3 o’clock in the morning to a text message alert saying, ‘Well, I need to reroute ambulance traffic, I need to deploy flood barriers,'” Glazer said.

Pointing out an area that is constantly flooded, and nearly flooded again earlier that morning, Anne Arundel County Executive Steuart Pittman called Maryland “ground zero” for the impact of climate change and said this new tool will help the community.

“Having the sensors is real time information. Quick. And information that our Office of Emergency Management can actually respond to,” he added. “It’s data that can then be used for predicting future impacts.”

There are two sensors already installed in Charles County, which is also seeing more frequent flooding, said Reuben Collins, the president of the Charles County Commissioners.

“What this provides for our first responders is more accessibility and ability to actually respond in real time, as opposed to waiting for the problem to reach the point where our residents are saying, ‘Look, we can’t even get out of our homes, or we can’t get back in our homes,'” Collins said. “We see this directly. We see the impact of what climate change is actually doing to our community.”

The flood sensor program is being run by Tim Canty, an associate professor of atmospheric and oceanic science at the University of Maryland.

“We don’t have a choice. We can’t turn our back on rising sea levels and hope for the best,” said Canty.

He said the sensors, which collect the data and then send out it via cellular technology, are plug-and-play simple.

“We’ve got one sensor near Cobb Island to help with them understanding the flooding leading into Cobb Island,” Canty said. “They have to station paramedics on Cobb Island before the bridge entrance floods. So now, we’re providing data in that area to give them kind of a heads up when that’s happening. We have sensors planned for the Deale Peninsula, because that’s had high flood risk. Downtown Baltimore has flood risk as well. We have a lot of places we want to start moving into.”

And because Hohonu puts all the data on a mobile app, it’s accessible to anyone, not just emergency and government leaders.

“This is all publicly available data,” Glazer explained. “You can log on. You can sign up for a text message alert when you get to a critical threshold of water level that’s important for you.”

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John started working at WTOP in 2016 after having grown up in Maryland listening to the station as a child. While he got his on-air start at small stations in Pennsylvania and Delaware, he's spent most of his career in the D.C. area, having been heard on several local stations before coming to WTOP.

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