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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
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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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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 Mosaics 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 3 min read
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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Last Updated Dec 17, 2024 Related Terms
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A Spooky Soliday: Haunting Whispers from the Martian Landscape
NASA’s Mars Perseverance rover acquired this image, which was selected by the public as the rover’s “Image of the Week,” of the martian landscape on the Jezero crater rim using its Left Mastcam-Z camera. The image was acquired on Oct. 22, 2024 (Sol 1306) at the local mean solar time of 13:45:41. NASA/JPL-Caltech/ASU The Perseverance rover lurks in the quiet, cold, desolate landscape of Jezero crater on Mars, a place masked in shadows and haunted by past mysteries. Built to endure the planet’s harsh conditions, Perseverance braves the thin atmosphere and extreme temperature swings. Its microphone captures the eerie whispers of martian winds, sending shivers down your spine, and records ghostly dust devils swirling across the barren terrain. Has the microphone caught the sound of a skeleton rattling its bones? We’ll leave that up to your imagination.
Recently, Perseverance navigated the sinister slopes of the Jezero crater rim, seeking out a series of ramshackle ridges to uncover the rim’s hidden geological secrets. The rover emerged from the shadows to descend into a field of light-toned rocks, illuminating the landscape reminiscent of bones and tombstones. Along the way, the rover encountered dark bedrock at Mist Park. Perseverance will then face another daunting climb back up the crater rim, venturing deeper into the great unknown.
Unlike vampires or other creatures of the night, Perseverance needs rest after long days of exploring the mystifying martian landscape. As night falls, the rover sleeps after watching the Sun sink below the horizon, casting ominous shadows across the landscape. The chilling winds howl through the night like a haunting lullaby for the fearless explorer. However, Perseverance sometimes wakes up from things that go bump in the night. While instruments mostly conduct their scientific measurements during the day, they are not afraid of the dark, often tasked with observing what lurks in the shadows and gazing at the martian night sky. Perseverance occasionally looks up to image the auroras and to get a glimpse of Phobos and Deimos, Mars’ two Moons.
Mars is like a hotel you can check in and out of, but you can never leave. It has become a graveyard of long-dead landers and rovers, but Perseverance is nowhere near ready to leave the land of the living. In fact, the ghosts of past rovers and landers guide Perseverance on its journey. As we continue to uncover the secrets of Mars, we are reminded of its past and the mysteries that still linger. Join us in pondering the mysteries of Mars as we explore its haunted history.
Written by Stephanie Connell, Ph.D. Student Collaborator at Purdue University
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Mars Perseverance Sol 1306: Left Mastcam-Z Camera
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By NASA
Name: Christine Knudson
Title: Geologist
Formal Job Classification: Research Assistant
Organization: Planetary Environments Laboratory, Science Directorate (Code 699)
Christine Knudson is a geologist at NASA’s Goddard Space Flight Center in Greenbelt, Md. She began graduate school in August 2012, the same month that NASA’s Curiosity rover landed on Mars. “It is very exciting to be part of the rover team and to be involved in an active Mars mission,” she says. “On days when we’re downlinking science data and I’m on shift, I am one of the first people to see data from an experiment done on Mars!”Courtesy of Christine Knudsen What do you do and what is most interesting about your role here at Goddard?
I am a geologist doing both laboratory and field work, primarily focusing on Mars analog research. I work on the Curiosity rover as part of the Sample Analysis at Mars (SAM) instrument team.
Why did you become a geologist?
As a child, I always loved being outside and I was really interested in all things related to the Earth. In college, I figured out that I wanted to be a geologist after taking an introduction to geology course. I wanted to learn more about the Earth and its interior, specifically volcanism.
What is your educational background?
In 2012, I received a B.S. in geology and environmental geoscience from Northern Illinois University. In August 2012, the same month that Curiosity landed on Mars, I started graduate school and in December 2014, I received a M.S. in geology from the same university. I focused on igneous geochemistry, investigating the pre-eruptive water contents of a Guatemalan volcano.
Why did you come to Goddard?
I came to Goddard in February 2015 to perform laboratory analyses of Mars analog materials, rock and mineral samples, from Earth, that the Curiosity rover and spectral orbiters have also identified on Mars. It is very exciting to be part of the rover team and to be involved in an active Mars mission.
What is a highlight of your work as a laboratory geologist doing Mars analog research?
Using laboratory analyses to interpret data we are getting back from Curiosity is incredibly exciting! I perform evolved gas analysis to replicate the analyses that the SAM instrument does on the rover. Curiosity scoops sand or drills into the rocks at stops along its drive through Gale Crater on Mars, then dumps the material into a small cup within the SAM instrument inside the rover. The rock is heated in a small oven to about 900 C [about 1650 F], and the instrument captures the gases that are released from the sample as it is heated. SAM uses a mass spectrometer to identify the different gases, and that tells us about the minerals that make up the rock.
We do the same analyses on rocks and minerals in our lab to compare to the SAM analyses. The other instruments on Curiosity also aid in the identification of the rocks, minerals, and elements present in this location on the Martian surface.
I also serve as a payload downlink lead for the SAM instrument. I check on the science and engineering data after we perform an experiment on Mars. On the days I’m on shift, I check to make sure that our science experiments finish without any problems, and that the instrument is “healthy,” so that the rover can continue driving and begin the science that is planned for the next sol.
On days when we’re downlinking science data and I’m on shift, I am one of the first people to see data from an experiment done on Mars!
What is some of the coolest field work you have done?
I have done Mars analog field work in New Mexico, Hawaii, and Iceland. The field work in Hawaii is exciting because one of our field sites was inside a lava tube on Mauna Loa. We expect that there are lava tubes on Mars, and we know that the interior of the tubes would likely be better shielded from solar radiation, which might allow for the preservation of organic markers. Scientifically, we’re interested in characterizing the rocks and minerals inside lava tubes to understand how the interior differs from the surface over time and to investigate differences in elemental availability as an accessible resource for potential life. Learning about these processes on Earth helps us understand what might be possible on Mars too.
“The field work in Hawaii is exciting because one of our field sites was inside a lava tube on Mauna Loa,” Knudson says. “We expect that there are lava tubes on Mars, and we know that the interior of the tubes would likely be better shielded from solar radiation, which might allow for the preservation of organic markers.”Courtesy of Christine Knudson I use handheld versions of laboratory instruments, some of which were miniaturized and made to fit on the Curiosity rover, to take in situ geochemical measurements — to learn what elements are present in the rocks and in what quantities. We also collect samples to analyze in the laboratory.
I also love Hawaii because the island is volcanically active. Hawaii Volcano National Park is incredible! A couple years ago, I was able to see the lava lake from an ongoing eruption within the crater of Kīlauea volcano. The best time to see the lava lake is at night because the glowing lava is visible from multiple park overlooks.
As a Mars geologist, what most fascinates you about the Curiosity rover?
When Curiosity landed, it was the largest rover NASA had ever sent to Mars: It’s about the size of a small SUV, so landing it safely was quite the feat! Curiosity also has some of the first science instruments ever made to operate on another planet, and we’ve learned SO much from those analyses.
Curiosity and the other rovers are sort of like robotic geologists exploring Mars. Working with the Curiosity rover allows scientists to do geology on Mars — from about 250 million miles away! Earth analogs help us to understand what we are seeing on Mars, since that “field site” is so incredibly far away and inaccessible to humans at this time.
What do you do for fun?
I spend most of my free time with my husband and two small children. We enjoy family hikes, gardening, and both my boys love being outside as much as I do.
I also enjoy yoga, and I crochet: I make hats, blankets, and I’m starting a sweater soon.
What is your “six-word memoir”? A six-word memoir describes something in just six words.
Nature-lover. Mom. Geologist. Cat-enthusiast. Curious. Snack-fiend.
By Elizabeth M. Jarrell
NASA’s Goddard Space Flight Center, Greenbelt, Md.
Conversations With Goddard is a collection of Q&A profiles highlighting the breadth and depth of NASA’s Goddard Space Flight Center’s talented and diverse workforce. The Conversations have been published twice a month on average since May 2011. Read past editions on Goddard’s “Our People” webpage.
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Last Updated Oct 16, 2024 EditorRob GarnerContactRob Garnerrob.garner@nasa.govLocationGoddard Space Flight Center Related Terms
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By NASA
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Reaching New Heights to Unravel Deep Martian History!
This is an image of the rim that the Perseverance rover took on sol 383 (March 19th, 2022) when it was traversing the crater floor. Dox Castle is located at the top of the image in the far ground. NASA/JPL-Caltech/ASU The Perseverance rover is reaching new heights as it ascends the rim of Jezero crater (over 300 meters in elevation higher than the original landing site)! The rover is now enroute to its first campaign science stop Dox Castle (image in the far ground) a region of interest for its potential to host ancient Mars’ bedrock in the exposed rocks on the rim.
Impact craters like Jezero may be the key to piecing together the early geologic history of Mars, as they provide a window into the history of the ancient crust by excavating and depositing deep crustal materials above the surface. Crater rims act as keepers of ancient Martian history, uplifting and exposing the stratigraphy of these impacted materials. Additionally, extreme heat from the impact can encourage the circulation of fluids through fractures similar to hydrothermal vents, which have implications for early habitability and may be preserved in the exposed rim bedrock. With the Perseverance rover we have the potential to explore some of the oldest exposed rocks on the planet.
Exploring such diverse terrains takes a lot of initial planning! The team has been preparing for the Crater Rim Campaign these last few months by working together to map out the types of materials Perseverance may encounter during its traverse up and through the rim. Using orbital images from the High-Resolution Imaging Science Experiment (HiRISE) instrument, the science team divided the rim area into 36 map quadrants, carefully mapping different rock units based on the morphologies, tones, and textures they observed in the orbital images. Mapping specialists then connected units across the quads to turn 36 miniature maps into one big geologic map of the crater rim. This resource is being used by the team to plan strategic routes to scientific areas of interest on the rim.
On Earth, geologic maps are made using a combination of orbital images and mapping in the field. Planetary scientists don’t typically get to check their map in the field, but we have the unique opportunity to validate our map using our very own robot geologist! Dox Castle will be our first chance to do rim science – and we’re excited to search for evidence of the transition between the margin and rim materials to start piecing together the stratigraphic history of the rocks that make up the rim of Jezero crater.
Written by Margaret Deahn, Ph.D. student at Purdue University
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Last Updated Sep 16, 2024 Related Terms
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