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By NASA
5 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
It’s a new year on Mars, and while New Year’s means winter in Earth’s northern hemisphere, it’s the start of spring in the same region of the Red Planet. And that means ice is thawing, leading to all sorts of interesting things. JPL research scientist Serina Diniega explains. NASA/JPL-Caltech Instead of a winter wonderland, the Red Planet’s northern hemisphere goes through an active — even explosive — spring thaw.
While New Year’s Eve is around the corner here on Earth, Mars scientists are ahead of the game: The Red Planet completed a trip around the Sun on Nov. 12, 2024, prompting a few researchers to raise a toast.
But the Martian year, which is 687 Earth days, ends in a very different way in the planet’s northern hemisphere than it does in Earth’s northern hemisphere: While winter’s kicking in here, spring is starting there. That means temperatures are rising and ice is thinning, leading to frost avalanches crashing down cliffsides, carbon dioxide gas exploding from the ground, and powerful winds helping reshape the north pole.
“Springtime on Earth has lots of trickling as water ice gradually melts. But on Mars, everything happens with a bang,” said Serina Diniega, who studies planetary surfaces at NASA’s Jet Propulsion Laboratory in Southern California.
Mars’ wispy atmosphere doesn’t allow liquids to pool on the surface, like on Earth. Instead of melting, ice sublimates, turning directly into a gas. The sudden transition in spring means a lot of violent changes as both water ice and carbon dioxide ice — dry ice, which is much more plentiful on Mars than frozen water — weaken and break.
“You get lots of cracks and explosions instead of melting,” Diniega said. “I imagine it gets really noisy.”
Using the cameras and other sensors aboard NASA’s Mars Reconnaissance Orbiter (MRO), which launched in 2005, scientists study all this activity to improve their understanding of the forces shaping the dynamic Martian surface. Here’s some of what they track.
Frost Avalanches
In 2015, MRO’s High-Resolution Imaging Science Experiment (HiRISE) camera captured a 66-foot-wide (20-meter-wide) chunk of carbon dioxide frost in freefall. Chance observations like this are reminders of just how different Mars is from Earth, Diniega said, especially in springtime, when these surface changes are most noticeable.
Martian spring involves lots of cracking ice, which led to this 66-foot-wide (20-meter-wide) chunk of carbon dioxide frost captured in freefall by the HiRISE camera aboard NASA’s Mars Reconnaissance Orbiter in 2015NASA/JPL-Caltech/University of Arizona “We’re lucky we’ve had a spacecraft like MRO observing Mars for as long as it has,” Diniega said. “Watching for almost 20 years has let us catch dramatic moments like these avalanches.”
Gas Geysers
Diniega has relied on HiRISE to study another quirk of Martian springtime: gas geysers that blast out of the surface, throwing out dark fans of sand and dust. These explosive jets form due to energetic sublimation of carbon dioxide ice. As sunlight shines through the ice, its bottom layers turn to gas, building pressure until it bursts into the air, creating those dark fans of material.
As light shines through carbon dioxide ice on Mars, it heats up its bottom layers, which, rather than melting into a liquid, turn into gas. The buildup gas eventually results in explosive geysers that toss dark fans of debris on to the surface.light shines through carbon dioxide ice on Mars But to see the best examples of the newest fans, researchers will have to wait until December 2025, when spring starts in the southern hemisphere. There, the fans are bigger and more clearly defined.
Spiders
Another difference between ice-related action in the two hemispheres: Once all the ice around some northern geysers has sublimated in summer, what’s left behind in the dirt are scour marks that, from space, look like giant spider legs. Researchers recently re-created this process in a JPL lab.
Sometimes, after carbon dioxide geysers have erupted from ice-covered areas on Mars, they leave scour marks on the surface. When the ice is all gone by summer, these long scour marks look like the legs of giant spiders.NASA/JPL-Caltech/University of Arizona Powerful Winds
For Isaac Smith of Toronto’s York University, one of the most fascinating subjects in springtime is the Texas-size ice cap at Mars’ north pole. Etched into the icy dome are swirling troughs, revealing traces of the red surface below. The effect is like a swirl of milk in a café latte.
“These things are enormous,” Smith said, noting that some are a long as California. “You can find similar troughs in Antarctica but nothing at this scale.”
As temperatures rise, powerful winds kick up that carve deep troughs into the ice cap of Mars’ north pole. Some of these troughs are as long as California, and give the Martian north pole its trademark swirls. This image was captured by NASA’s now-inactive Mars Global Surveyor.NASA/JPL-Caltech/MSSS Fast, warm wind has carved the spiral shapes over eons, and the troughs act as channels for springtime wind gusts that become more powerful as ice at the north pole starts to thaw. Just like the Santa Ana winds in Southern California or the Chinook winds in the Rocky Mountains, these gusts pick up speed and temperature as they ride down the troughs — what’s called an adiabatic process.
Wandering Dunes
The winds that carve the north pole’s troughs also reshape Mars’ sand dunes, causing sand to pile up on one side while removing sand from the other side. Over time, the process causes dunes to migrate, just as it does with dunes on Earth.
This past September, Smith coauthored a paper detailing how carbon dioxide frost settles on top of polar sand dunes during winter, freezing them in place. When the frost all thaws away in the spring, the dunes begin migrating again.
Surrounded by frost, these Martian dunes in Mars’ northern hemisphere were captured from above by NASA’s Mars Reconnaissance Orbiter using its HiRISE camera on Sept. 8, 2022. NASA/JPL-Caltech/University of Arizona Each northern spring is a little different, with variations leading to ice sublimating faster or slower, controlling the pace of all these phenomena on the surface. And these strange phenomena are just part of the seasonal changes on Mars: the southern hemisphere has its own unique activity.
More About MRO
The University of Arizona, in Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., in Boulder, Colorado. NASA’s Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Mars Reconnaissance Orbiter Project for NASA’s Science Mission Directorate, Washington.
For more information, visit:
https://science.nasa.gov/mission/mars-reconnaissance-orbiter
News Media Contacts
Andrew Good
Jet Propulsion Laboratory, Pasadena, Calif.
818-393-2433
andrew.c.good@jpl.nasa.gov
Karen Fox / Molly Wasser
NASA Headquarters, Washington
202-358-1600
karen.c.fox@nasa.gov / molly.l.wasser@nasa.gov
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Last Updated Dec 20, 2024 Related Terms
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Sols 4398-4401: Holidays Ahead, Rocks Under the Wheels
NASA’s Mars rover Curiosity acquired this image using its Left Navigation Camera on Dec. 17, 2024, at 23:24:13 UTC — Sol 4396, or Martian day 4,396, or the Mars Science Laboratory mission. NASA/JPL-Caltech Earth planning date: Wednesday, Dec. 18, 2024
It’s almost holiday time, and preparations are going ahead on Earth and Mars! For myself that means having a packed suitcase sitting behind me to go on my holiday travels tomorrow morning. For Curiosity that means looking forward to a long semi-rest, as we will not do our usual planning for the geology and mineralogy, but will still be monitoring the atmospheric conditions throughout. Today should have been a normal planning day with lots of contact and remote science. Well, Mars had other ideas.
The regular readers of this blog know that we are driving through quite difficult terrain. The image above gives a good impression on what the rover is dealing with: lots of rocks embedded in sand. I think even hiking would be quite difficult there, let alone driving autonomously. Curiosity, thanks to our excellent rover drivers, makes it successfully most of the time, but here and there Mars just doesn’t play nice. Thus, the rover stopped after 14 meters (about 46 feet) of a planned much longer drive. One of the wheels had caught a low spot between two rocks, and — safety first — the rover stopped and waited for our assessment. The rover drivers found no major problem, as it’s just the middle wheel that hit a bit of a rough patch, and driving can continue in this plan. But better safe than sorry, especially on another planet where there are no tow trucks to get us out of difficulty!
There was, however, quite a bit of discussion before we decided that course of action. Not because of the wheels themselves, but because the rover also stands in a position where it can only communicate directly with Earth in limited ways as the antenna is not facing the expected direction after the sudden stop. Of course, we still have the orbiters to talk to our rover, so we know it’s all fine. And — all things are three — this all happened on the penultimate plan of the year! Friday we’ll be planning a large set of sols that the rover will be executing on its own on Mars, monitoring the atmosphere and taking regular images of its surroundings, while the Earth-based team enjoys the well-deserved break. We really want to make sure to have everything going right on a day like today, so we all can enjoy the holidays without worrying about the rover!
With today being the last day of normal science planning, we had lots of ideas, but had to keep the arm stowed. The drive fault also meant that we had to forego arm movements, as the rover was sitting on a few rocks, and one of the wheels in that little depression that stopped us, all in ways that meant that a shift of rover weight (such as occurs when we move the arm) could make the rover move. Avoiding this situation, the team kept the arm stowed and focused on remote observations today. ChemCam observes a vein target called “Monrovia Peak” and takes remote images on the target “Jawbone Canyon” and up Mount Sharp toward the yardang unit. Mastcam looks at the target “Circle X Ranch” to investigate the material around the rocks embedded in the sand, looks at “Anacapa Island,” which is a vein target, “Channel Islands,” which is an aeolian ripple, and target “Gould Mesa,” which gets the team especially excited as this is the first glimpse of the so-called boxwork structures, which we saw from orbit even before Curiosity landed. Finally, we drive away from the spot that held us up today. Let’s hope Mars has read the script this time!
For the looooong break, we are planning autonomous and remote investigations only, and this starts before Friday’s planning, so that we know all is ok! Thus, the other three sols in today’s planning have Aegis, the automated ChemCam LIBS observation, a Mastcam 360° mosaic, and many, many atmospheric observations. It’s going to be a feast for DAN, REMS, and generally the atmospheric science on Mars, while here on Earth we enjoy the treats of the season. The Curiosity team hopes you do, too. See you in 2025!
Written by Susanne Schwenzer, Planetary Geologist at The Open University
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Last Updated Dec 20, 2024 Related Terms
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Step into the holidays with this picturesque ‘winter wonderland’ scene at the south pole of Mars, captured by ESA’s Mars Express.
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Sols 4396-4397: Roving in a Martian Wonderland
NASA’s Mars rover Curiosity acquired this image using its Right Navigation Camera on Dec. 16, 2024 at 00:22:16 UTC — sol 4394, or Martian day 4,394 of the Mars Science Laboratory mission. NASA/JPL-Caltech Earth planning date: Monday, Dec. 16, 2024
Over the weekend Curiosity continued her trek around the northern end of Texoli butte, taking in the beautiful views in all directions. Steep buttes reveal cross-sections through ancient sedimentary strata, while the blocks in our workspace contain nice layers and veins — a detailed record of past surface processes on Mars. Sometimes we get so used to our normal routine of rover operations that I almost forget how incredible it is to be exploring ancient sedimentary rocks on another planet and seeing new data every day. Curiosity certainly found a beautiful field site!
But the challenges are a good reminder of what it takes to safely explore Mars. We had hoped that the weekend drive could be extended a little bit using a guarded driving mode (using auto navigation), but the drive stopped early during the guarded portion. Because the drive stopped short, we did not have adequate imaging around all of the rover wheels to fully assess the terrain, which meant that unfortunately Curiosity did not pass the Slip Risk Assessment Process (SRAP) and we could not use the rover arm for contact science today. The team quickly pivoted to remote sensing, knowing there will be other chances to use the instruments on the arm in upcoming plans.
Today’s two-sol plan includes targeted science and a drive on the first sol, followed by untargeted remote sensing on the second sol. The Geology and Mineralogy Theme Group planned ChemCam LIBS and Mastcam on a target named “Avalon” to characterize a dark vein that crosscuts the bedrock in our workspace. Then Curiosity will acquire two long-distance RMI mosaics to document the first glimpse of distant boxwork structures, and a view of the top of Mount Sharp from this perspective. This Martian wonderland includes a lot of beautiful sedimentary structures and fractures, so the team planned Mastcam mosaics to assess a stratigraphic interval that may contain more climbing ripples, another mosaic to characterize the orientation of fractures, and a third mosaic to look at veins and sedimentary layers. Then Curiosity will drive about 50 meters (about 164 feet) to the southwest, and will take post-drive imaging to prepare for planning on Wednesday. The second sol is untargeted, so GEO added an autonomously selected ChemCam LIBS target. The plan includes standard DAN and REMS environmental monitoring activities, plus a dust-devil movie and Navcam line-of-sight observation to assess atmospheric dust.
I was on shift as Long-Term Planner today, so in addition to thinking about today’s plan, we’re already looking ahead at the activities that the rover will conduct over the December holidays. We’re gearing up to send Curiosity our Christmas wish list later this week, and feeling grateful for the gifts she has already sent us!
Written by Lauren Edgar, Planetary Geologist at USGS Astrogeology Science Center
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4 Min Read Celebrating 20 Years: Night Sky Network
2023 Partial Solar Eclipse Viewing at Camino Real Marketplace with the View the Santa Barbara Astronomical Unit. Credits:
Photo by Chuck McPartlin by Vivan White & Kat Troche of the Astronomical Society of the Pacific
NASA’s Night Sky Network is one of the most successful and longstanding grassroots initiatives for public engagement in astronomy education. Started in 2004 with the PlanetQuest program out of the Jet Propulsion Laboratory and currently supported by NASA’s Science Activation, the Night Sky Network (NSN) plays a critical role in fostering science literacy through astronomy. By connecting NASA science and missions to support amateur astronomy clubs, NSN leverages the expertise and enthusiasm of club members, who bring this knowledge to schools, museums, observatories, and other organizations, bridging the gap between NASA science and the public. Now in its 20th year, NSN supports over 400 astronomy clubs dedicated to bringing the wonder of the night sky to their communities across the US, connecting with 7.4 million people across the United States and its territories since its inception.
International Observe the Moon Night, September 2024 Credit: Oklahoma City Astronomy Club Humble Beginnings
It all started with an idea – astronomy clubs already do great outreach, and club members know a lot of astronomy (shown definitively by founder Marni Berendsen’s research), and they love to talk with the public – how could NASA support these astronomy clubs in sharing current research and ideas using informal activities designed for use in the places that amateur astronomers do outreach. Thanks to funding through NASA JPL’s PlanetQuest public engagement program, the Night Sky Network was born in 2004, with more than 100 clubs joining the first year.
Raynham Public Observing Night, February 2004 Credit: Astronomical Society of Southern New England/Mark Gibson As quoted from the first NSN news article, “NASA is very excited to be working closely with the amateur astronomy community,” said Michael Greene, current Director for Communications and Education and former head of public engagement for JPL’s Navigator Program and PlanetQuest initiatives, “Amateurs want more people to look at the sky and understand astronomy, and so do we. Connecting what we do with our missions to the sense of wonder that comes when you look up at the stars and the planets is one of our long-term objectives. We have a strong commitment to inspiring the next generation of explorers. Lending support to the energy that the amateur astronomy community brings to students and the public will allow NASA to reach many more people.”
Taking off like a rocket, Night Sky Network had over 100 clubs registered on their website within the first year.
The Toolkits
Outreach Toolkits were developed to assist clubs with their endeavors. These kits included educational materials, hands-on activities, and guides to explaining topics in an accessible way. So far, 13 toolkits have been created with topics ranging from the scale of the universe to how telescopes work. To qualify for these free Toolkits, clubs must be active in their communities, hosting two outreach events every three months or five outreach events within a calendar year. Supplemental toolkits were also created based on special events, such as the solar eclipses and the 50th anniversary of Apollo’s Moon landing. A new toolkit is in development to teach audiences about solar science, and NSN is on track to support clubs well into the future.
Rye Science Day, October 2014 Credit: Southern Colorado Astronomical Society/Malissa Pacheco NSN also hosts archived video trainings on these toolkits and other topics via its YouTube channel and a monthly webinar series with scientists from various institutions worldwide. Lastly, a monthly segment called Night Sky Notes is produced for clubs to share with their audiences via newsletters and mailing lists.
Sharing the Universe
In 2007, a National Science Foundation grant provided funding for further research into astronomy club needs. From that came three resources for clubs – the Growing Your Astronomy Club and Getting Started with Outreach video series, as well as an updated website with a national calendar and club and event coordination. Now you can find hundreds of events each month across the country, including virtual events that you can join from anywhere.
Night Sky Network: Current and Future
Map of Night Sky Network clubs within the United States, as of November 2024 Credit: Night Sky Network/Google Maps View the full article
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