NASA's Perseverance Rover Will Peer Beneath Mars' Surface
The agency's newest rover will use the first ground-penetrating radar instrument on the Martian surface to help search for signs of past microbial life.
After touching down on the Red Planet Feb. 18, 2021, NASA's
Mars 2020 Perseverance rover will scour Jezero
Crater to help us understand its geologic history and search for signs of
past microbial life. But the six-wheeled robot won't be looking just at the
surface of Mars: The rover will peer deep below it with a ground-penetrating
radar called RIMFAX.
Unlike similar instruments aboard Mars orbiters, which study
the planet from space, RIMFAX
will be the first ground-penetrating radar set on the surface of Mars. This
will give scientists much higher-resolution data than space-borne radars can
provide while focusing on the specific areas that Perseverance will explore. Taking
a more focused look at this terrain will help the rover's team understand how
features in Jezero Crater formed over time.
Short for Radar Imager for Mars' Subsurface Experiment,
RIMFAX can provide a highly detailed view of subsurface structures down to at
least 30 feet (10 meters) underground. In doing so, the instrument will reveal
hidden layers of geology and help find clues to past environments on Mars,
especially those that may have provided the conditions necessary for supporting
life.
"We take an image of the subsurface directly beneath
the rover," said Svein-Erik Hamran, the instrument's principal
investigator, with the University of Oslo in Norway. "We can do a 3D model
of the subsurface - of the different layers - and determine the geological
structures underneath."
While Mars is a frigid desert today, scientists suspect that
microbes may have lived in Jezero during wetter times billions of years ago and
that evidence of such ancient life may be preserved in sediments in the crater.
Information from RIMFAX will help pinpoint areas for deeper study by
instruments on the rover that search for chemical, mineral, and textural clues found
within rocks that may be signs of past microbial life. Ultimately, the team
will collect dozens of drill-core samples with Perseverance, seal them in tubes
that will be deposited on the surface for return to Earth by future missions.
That way, these first samples from another planet can be studied in
laboratories with equipment too large to take to Mars.
Traveling Back in Time
Scientists believe the 28-mile-wide (45-kilometer-wide) Jezero
Crater formed when a large object collided with Mars, kicking up rocks from
deep in the planet's crust. More than 3.5 billion years ago, river channels
spilled into the crater, creating a lake that was home to a fan-shaped river
delta.
Hamran hopes RIMFAX will shed light on how the delta formed.
"This is not so easy, based on surface images only, because you have this
dust covering everything, so you may not necessarily see all the changes in
geology."
He and his science team will stack successive radar
soundings to create a two-dimensional subsurface image of the crater floor.
Eventually, data will be combined with images from a camera on the rover to
create a 3D topographical image.
The instrument employs the same type of ground-penetrating
radar used here on Earth to find buried utilities, underground caverns, and the
like. In fact, Hamran uses it to study glaciers. Tens of millions of miles away
on Mars, however, he and his colleagues will be relying on Perseverance to do
the work as it roams through Jezero Crater. "We do some measurements while
we are stationary," he said, "but most measurements will actually be
gathered while the rover is driving."
More About the Mission
A key objective for Perseverance's mission on Mars is astrobiology, including the search
for signs of ancient microbial life. The rover will characterize the planet's
ancient climate and geology, pave the way for human exploration of the Red Planet,
and be the first mission to collect and cache Martian rock and regolith (broken
rock and dust).
Subsequent missions, currently under consideration by NASA
in cooperation with ESA (the European Space Agency), would send spacecraft to
Mars to collect these cached samples from the surface and return them to Earth
for in-depth analysis.
The Mars 2020 mission is part of a larger program that
includes missions to the Moon as a way to prepare for human exploration of the
Red Planet. Charged with returning astronauts to the Moon by 2024, NASA will
establish a sustained human presence on and around the Moon by 2028 through
NASA's Artemis lunar
exploration plans.
JPL, which is managed for NASA by
Caltech in Pasadena, California, built and manages operations of the
Perseverance and Curiosity rovers.
For more about Perseverance:
mars.nasa.gov/mars2020/
nasa.gov/perseverance
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