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By NASA
4 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
NASA’s Voyager 2 captured this image of Uranus while flying by the ice giant in 1986. New research using data from the mission shows a solar wind event took place during the flyby, leading to a mystery about the planet’s magnetosphere that now may be solved.NASA/JPL-Caltech NASA’s Voyager 2 flyby of Uranus decades ago shaped scientists’ understanding of the planet but also introduced unexplained oddities. A recent data dive has offered answers.
When NASA’s Voyager 2 spacecraft flew by Uranus in 1986, it provided scientists’ first — and, so far, only — close glimpse of this strange, sideways-rotating outer planet. Alongside the discovery of new moons and rings, baffling new mysteries confronted scientists. The energized particles around the planet defied their understanding of how magnetic fields work to trap particle radiation, and Uranus earned a reputation as an outlier in our solar system.
Now, new research analyzing the data collected during that flyby 38 years ago has found that the source of that particular mystery is a cosmic coincidence: It turns out that in the days just before Voyager 2’s flyby, the planet had been affected by an unusual kind of space weather that squashed the planet’s magnetic field, dramatically compressing Uranus’ magnetosphere.
“If Voyager 2 had arrived just a few days earlier, it would have observed a completely different magnetosphere at Uranus,” said Jamie Jasinski of NASA’s Jet Propulsion Laboratory in Southern California and lead author of the new work published in Nature Astronomy. “The spacecraft saw Uranus in conditions that only occur about 4% of the time.”
The first panel of this artist’s concept depicts how Uranus’s magnetosphere — its protective bubble — was behaving before the flyby of NASA’s Voyager 2. The second panel shows an unusual kind of solar weather was happening during the 1986 flyby, giving scientists a skewed view of the magnetosphere.NASA/JPL-Caltech Magnetospheres serve as protective bubbles around planets (including Earth) with magnetic cores and magnetic fields, shielding them from jets of ionized gas — or plasma — that stream out from the Sun in the solar wind. Learning more about how magnetospheres work is important for understanding our own planet, as well as those in seldom-visited corners of our solar system and beyond.
That’s why scientists were eager to study Uranus’ magnetosphere, and what they saw in the Voyager 2 data in 1986 flummoxed them. Inside the planet’s magnetosphere were electron radiation belts with an intensity second only to Jupiter’s notoriously brutal radiation belts. But there was apparently no source of energized particles to feed those active belts; in fact, the rest of Uranus’ magnetosphere was almost devoid of plasma.
The missing plasma also puzzled scientists because they knew that the five major Uranian moons in the magnetic bubble should have produced water ions, as icy moons around other outer planets do. They concluded that the moons must be inert with no ongoing activity.
Solving the Mystery
So why was no plasma observed, and what was happening to beef up the radiation belts? The new data analysis points to the solar wind. When plasma from the Sun pounded and compressed the magnetosphere, it likely drove plasma out of the system. The solar wind event also would have briefly intensified the dynamics of the magnetosphere, which would have fed the belts by injecting electrons into them.
The findings could be good news for those five major moons of Uranus: Some of them might be geologically active after all. With an explanation for the temporarily missing plasma, researchers say it’s plausible that the moons actually may have been spewing ions into the surrounding bubble all along.
Planetary scientists are focusing on bolstering their knowledge about the mysterious Uranus system, which the National Academies’ 2023 Planetary Science and Astrobiology Decadal Survey prioritized as a target for a future NASA mission.
JPL’s Linda Spilker was among the Voyager 2 mission scientists glued to the images and other data that flowed in during the Uranus flyby in 1986. She remembers the anticipation and excitement of the event, which changed how scientists thought about the Uranian system.
“The flyby was packed with surprises, and we were searching for an explanation of its unusual behavior. The magnetosphere Voyager 2 measured was only a snapshot in time,” said Spilker, who has returned to the iconic mission to lead its science team as project scientist. “This new work explains some of the apparent contradictions, and it will change our view of Uranus once again.”
Voyager 2, now in interstellar space, is almost 13 billion miles (21 billion kilometers) from Earth.
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Last Updated Nov 11, 2024 Related Terms
Voyager 2 Heliophysics Jet Propulsion Laboratory Magnetosphere Solar Wind Uranus Uranus Moons Explore More
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By NASA
Curiosity Navigation Curiosity Home Mission Overview Where is Curiosity? Mission Updates Science Overview Instruments Highlights Exploration Goals News and Features Multimedia Curiosity Raw Images Images Videos Audio More Resources Mars Missions Mars Sample Return Mars Perseverance Rover Mars Curiosity Rover MAVEN Mars Reconnaissance Orbiter Mars Odyssey More Mars Missions The Solar System The Sun Mercury Venus Earth The Moon Mars Jupiter Saturn Uranus Neptune Pluto & Dwarf Planets Asteroids, Comets & Meteors The Kuiper Belt The Oort Cloud 2 min read
Sols 4323-4324: Surfin’ Our Way out of the Channel
An image from NASA’s Mars rover Curiosity, looking back at the western edge of the Gediz Vallis deposit (top left) and the channel wall in the sulfate unit with unconsolidated sand/soil deposits in the foreground. This image was taken by Curiosity’s Left Navigation Camera on Sol 4321 — Martian day 4,321 of the Mars Science Laboratory mission — on Oct. 2, 2024, at 02:13:27 UTC. NASA/JPL-Caltech Earth planning date: Wednesday, Oct. 2, 2024
As a member of the group tasked with organizing our campaign to investigate the Gediz Vallis channel and deposit (informally known as the Channel Surfers), I was a little sad this morning to see that our drive had successfully taken us out of the channel, back onto the magnesium sulfate-bearing unit, into which the channel is incised. Our long-anticipated investigation of the channel has proven fruitful: Curiosity made the first definitive detection of elemental sulfur on Mars, and we have examined a variety of intriguing lithologies and relationships within the deposit over the last 4.5 months. It has been an exciting time, and I have particularly enjoyed riding this wave with my fellow Channel Surfers — a great team! Now to make sense of all the fantastic data we have collected.
We are not completely done looking at the channel and deposits though. We will be driving parallel to the western margin for a while to facilitate comparisons with what we observed from the east. Tosol we will image two areas of interest within the Gediz Vallis channel from our current vantage point with Mastcam and ChemCam long-distance RMI. But back to the sulfate unit — the team planned a number of activities to document the return to the sulfate unit. These include APXS and MAHLI of the nodular bedrock immediately in front of the rover (“Sub Dome”), ChemCam LIBS and Mastcam of another bedrock block (“Vert Lost Grove”), and Mastcam of the resistant bedrock ridge immediately adjacent to the Gediz Vallis channel (“Muah Mountain”).
Once the drive of about 25 meters (about 82 feet) hopefully executes successfully, Curiosity will look down and image the terrain between her front wheels with MARDI, acquire ChemCam LIBS on an autonomously selected target in the workspace, and then perform a series of atmospheric and environmental observations. These include a Mastcam tau to measure dust in the atmosphere, Navcam dust devil and suprahorizon movies, and a Navcam line-of-sight observation. The plan is rounded out with DAN, RAD, and REMS activities.
Written by Lucy Thompson, Planetary Geologist at University of New Brunswick
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Last Updated Oct 03, 2024 Related Terms
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Sols 4318-4320: One Last Weekend in the Channel
This image from NASA’s Mars rover Curiosity shows the bright-toned rocks of the “Sheep Creek” target location, intriguing because of their resemblance to previous targets that contained unexpectedly high levels of elemental sulfur. The Left Navigation Camera aboard Curiosity captured this image on Sol 4316 — Martian day 4,316 of the Mars Science Laboratory mission — on Sept. 26, 2024, at 21:10:13 UTC. NASA/JPL-Caltech Earth planning date: Friday, Sept. 27, 2024
We’re wrapping up our time in the channel with the highly anticipated examination of the “Sheep Creek” white stones. Last plan’s reposition was a success, so we are able to go ahead with contact science on them this weekend. MAHLI and APXS picked three targets to investigate: “Cloud Canyon,” “Moonlight Lake,” and “Angora Mountain,” all of which sound so lovely and soft, and are quite evocative of these pale stones, which stand out so much against the background. ChemCam is also examining another of the white stones, “Pee Wee Lake.”
Since this is looking like it will be our last weekend in the channel, we’re packing the plan with all the other last-chance targets before we leave them behind. Mastcam is making a large survey of some other light-toned rocks in the middle distance dubbed “Orchid Lake,” as well as getting a bit more context for an old target, “Marble Falls,” which we first imaged almost two weeks ago. A bit closer to the rover, it will examine a target we’re calling “Brown Bear Pass,” to study the surface properties of the soil. Mastcam will also be looking backwards at our tracks to see if we turned up anything interesting in our travels. And ChemCam has a couple of long-distance observations of another familiar target, “Buckeye Ridge.”
After all that, it’s time for us to turn back around and head toward the edge of the channel with a drive of 55 meters (about 180 feet) back to our exit point. Even then, our weekend still isn’t over. We have a ChemCam-filled third sol, using AEGIS to autonomously select a target, and then getting a passive sky observation to keep an eye on the amount of different gases like oxygen and water vapor in the atmosphere. Speaking of the atmosphere, here on the environmental side we’re kept busy this weekend looking for dust devils and clouds, and keeping an eye on the amount of dust in the air around us. We’ll wrap up the weekend as we often do — with an early morning dedicated environmental science block.
Written by Alex Innanen, Atmospheric Scientist at York University
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By European Space Agency
Video: 00:03:12 There’s a mystery out there in deep space – and solving it will make Earth safer. That’s why the European Space Agency’s Hera mission is taking shape – to go where one particular spacecraft has gone before.
On 26 September 2022, moving at 6.1 km/s, NASA’s DART spacecraft crashed into the Dimorphos asteroid. Part of our Solar System changed. The impact shrunk the orbit of the Great Pyramid-sized Dimorphos around its parent asteroid, the mountain-sized Didymos.
This grand experiment was performed to prove we could defend Earth against an incoming asteroid, by striking it with a spacecraft to deflect it. DART succeeded. But that still leaves many things scientists don’t know: What is the precise mass and makeup of Dimorphos? What did the impact do to the asteroid? How big is the crater left by DART’s collision? Or has Dimorphos completely cracked apart, to be held together only by its own weak gravity?
That’s why we’re going back – with ESA’s Hera mission. The spacecraft will revisit Dimorphos to gather vital close-up data about the deflected body, to turn DART’s grand-scale experiment into a well-understood and potentially repeatable planetary defence technique.
The mission will also perform the most detailed exploration yet of a binary asteroid system – although binaries make up 15% of all known asteroids, one has never been surveyed in detail.
Hera will also perform technology demonstration experiments, including the deployment ESA’s first deep space ‘CubeSats’ – shoebox-sized spacecraft to venture closer than the main mission then eventually land – and an ambitious test of 'self-driving' for the main spacecraft, based on vision-based navigation.
By the end of Hera’s observations, Dimorphos will become the best studied asteroid in history – which is vital, because if a body of this size ever struck Earth it could destroy a whole city. The dinosaurs had no defence against asteroids, because they never had a space agency. But – through Hera – we are teaching ourselves what we can do to reduce this hazard and make space safer.
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