A field team sets up equipment in a dry lakebed in the Nevada

Perseverance Field Team Sets up in Nevada Desert: Standing in for a rover, a field team sets up equipment in a dry lakebed in the Nevada desert in February 2020. As part of the exercise, scientists spread around the world sent commands for images and data, as they will once Perseverance lands on Mars in February 2021. Credit: NASA/JPL-Caltech. Download image ›

Team members searched for signs of ancient microscopic life there, just as NASA's latest rover will on the Red Planet next year.

Billions of years ago, the Martian surface could have supported microbial life as we know it. But did such life ever actually exist there? NASA and its Mars 2020 mission hope to find out with the Perseverance rover, which launches to the Red Planet this summer.

Desert ‘Rover’ Helps NASA Scientists Prepare for Mars: A seven-person field team served as a simulated rover, carrying cameras and science instruments to the Nevada desert. Meanwhile, mission scientists at institutions like NASA’s Jet Propulsion Laboratory in Southern California sent commands for them to take pictures or collect data from the landscape. Credit: NASA/JPL-Caltech. Download video ›
Scientists have sought answers to astrobiological questions on Earth, studying regions similar enough to Mars to understand what the Red Planet's microscopic fossil record might look like. One research trip late last year involved fossilized microbes in the Australian Outback. Earlier this year, seven mission scientists headed to a dry lakebed in Nevada as 150 worked with them remotely for the Rover Operations Activities for Science Team Training, aka the ROASTT.

Scientists setting up equipment
Cameras in the Nevada Desert: Two members of the field team set up cameras as part of the simulated rover operation. The images they provided were intended to stand in for what a rover's instruments might send back from Mars. Credits: NASA/JPL-Caltech. Download image ›

Rather than bringing a car-sized rover, the seven field team members stood in for it. Wielding cameras and portable spectrometers during simulated operations spread out over a two-week period, they received instructions from the scientists located elsewhere, just as the rover will after it lands on Feb. 18, 2021.

Like all Mars rovers, Perseverance will be run by a distributed team of scientists and engineers — some located in the operations center at NASA's Jet Propulsion Laboratory, which leads the new mission, and some located at research institutions around the world. They will discuss where to go, which samples to study, and — for the first time — which rocks to collect in metal tubes for eventual return to Earth for deeper study.

Scientists setting up instruments in the Nevada desert
Subsurface Radar That Looks Like a Jogging Stroller: A member of a science field team operates a subsurface radar in the Nevada desert in February 2020 as part of a practice exercise that lasted several days. Credit: NASA/JPL-Caltech. Download image ›

The Nevada exercise not only helped team members practice what to look for with Perseverance; it helped them get used to working with one another and with the rover. The field site was also an opportunity for research: Besides simulating a rover, the field team members were studying the field site, providing insights that could help shape the search for past life on Mars.

If a cliffside seemed promising, scientists on conference lines around the globe debated whether the field team should "drive" closer; if a set of rocks appeared ideal for preserving fossils, they would order close-up images from the field team. A ray-gun-like laser instrument mimicked Perseverance's rock-analyzing SuperCam; another handheld tool shot X-rays like the rover's Planetary Instrument for X-ray Lithochemistry (PIXL) will; a ground-penetrating radar was carted around in what looked like a jogger stroller to peer below the surface, mimicking the Radar Imager for Mars' Subsurface Experiment (RIMFAX).

The field team also had an important low-tech tool: a cheap broom used to sweep away their footprints, both to preserve the Martian feel of the landscape and to avoid providing the remote scientist a sense of scale in the rock images they were providing.

A Patch of Mars in Nevada

stromatolites in a dry lakebed
Stromatolites in the Nevada Desert: Made from fossilized microbes and sediment, these rounded rocks are stromatolites that were found in a dry lakebed during the field exercise. Credits: NASA/JPL-Caltech. Download image ›
Walker Lake is an ideal training ground for spotting ancient microscopic life. The lake once extended much farther than it does today; the parts of it that dried up tens of thousands of years ago are now studded with stromatolites — collections of fossilized microbes and sediment that have hardened into what often look like bulbous, moundlike growths. It remains to be seen whether Jezero Crater, Perseverance's landing site, has anything akin to stromatolites, but it, too, is an ancient lakebed.

Besides helping scientists think about biosignatures, or signs of ancient life, the training also demonstrated how working with Perseverance will take teamwork and careful coordination.

"It's especially important for scientists who are new to Mars rovers," said JPL scientist Raymond Francis, who led the field team. "It's a team effort, and everyone has to learn how their roles fit into the whole mission."

One Rover, Many Decisions

Lisa Mayhew, a geochemist and geomicrobiologist at the University of Colorado Boulder, is one of those newcomers. To study the relationship between water, rocks and microbial life in extreme environments, she's worked with deep-sea remotely operated vehicles, like the Woods Hole Oceanographic Institution's Jason. In places such as the Lost City, located at the bottom of the Atlantic Ocean, she's watched Jason explore craggy mineral towers. Microbes in and on these towers thrive by metabolizing energy-rich gases, like hydrogen and methane, produced from reactions between water and rock. Some scientists think life on Earth may have originated in such places.

Similarly to a Mars rover, Jason sends back images, and its robotic arms can be deployed to move rocks and take samples. But Mars is much farther away than the ocean floor. Only so many commands can be sent to Perseverance each day, and only so much data can be sent back.

Scientists training in a conference room
Scientists Training for Mars Rover Operations: Scientists at NASA's Jet Propulsion Laboratory participate in a training exercise in February 2020. They reviewed images and data sent by a field team in the Nevada desert, discussing where to send their simulated "rover" next. Credits: NASA/JPL-Caltech. Download image ›

That's why every rover mission has to balance the desire to deepen the team's understanding of one site with the need to sample the geologic diversity available down the road.

The Walker Lake exercise underscored for Mayhew just how many decisions go into managing a Mars rover. "While it's similar in many ways to operating and directing Jason, it's happening on a much larger scale and you're pretty clueless until you're actually planning a rover drive," she said. "You have to learn all the different software tools and understand the distinction between different roles."

At the end of the training, participating scientists said they had a much better idea of how a rover team works. What's more, the scientists had chosen a sample that was rich with biosignatures.

"The next time we do this will be on Mars," said JPL's Ken Williford, one of the mission's deputy project scientists. "We've got to get the right samples. Let's bring them back."

Two scientists working in the Nevada desert
Science on the Horizon: Michael Tuite and Rachel Kronyak of NASA's Jet Propulsion Laboratory served as part of the desert field team, sending images and data for review by scientists who will work with NASA's Perseverance Mars rover. Credits: NASA/JPL-Caltech. Download image ›

Perseverance is a robotic scientist weighing about 2,260 pounds (1,025 kilograms). The rover's mission will search for signs of past microbial life. It will characterize the planet's climate and geology, collect samples for future return to Earth, and pave the way for human exploration of the Red Planet. No matter what day Perseverance launches during its July 17-Aug. 5 launch period, it will land at Mars' Jezero Crater on Feb. 18, 2021.

The Mars 2020 Perseverance rover 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.

For more information about Perseverance, visit:



News Media Contacts
Andrew Good
Jet Propulsion Laboratory, Pasadena, Calif.

Alana Johnson
NASA Headquarters, Washington

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