Is There Life on Mars? NASA’s AI Rovers Might Soon Tell Us

Called “adaptive sampling,” the software autonomously positions the instrument close to a rock target, then looks at PIXL’s scans of the target to find minerals worth examining more deeply. It’s all done in real time, without the rover talking to mission controllers back on Earth.

Advances in Rover Autonomy and Sample Collection

“We use PIXL’s AI to home in on key science,” said the instrument’s principal investigator, Abigail Allwood of JPL. “Without it, you’d see a hint of something interesting in the data and then need to rescan the rock to study it more. This lets PIXL reach a conclusion without humans examining the data.”

Data from Perseverance’s instruments, including PIXL, helps scientists determine when to drill a core of rock and seal it in a titanium metal tube so that it, along with other high-priority samples, could be brought to Earth for further study as part of NASA’s Mars Sample Return campaign.

This image of a rock target nicknamed “Thunderbolt Peak” was created by NASA’s Perseverance Mars rover using PIXL, which determines the mineral composition of rocks by zapping them with X-rays. Each blue dot in the image represents a spot where an X-ray hit. Credit: NASA/JPL-Caltech/DTU/QUT

Extending AI Capabilities Beyond Mars

Adaptive sampling is not the only application of AI on Mars. About 2,300 miles (3,700 kilometers) from Perseverance is NASA’s Curiosity, which pioneered a form of AI that allows the rover to autonomously zap rocks with a laser based on their shape and color. Studying the gas that burns off after each laser zap reveals a rock’s chemical composition. Perseverance features this same ability, as well as a more advanced form of AI that enables it to navigate without specific direction from Earth. Both rovers still rely on dozens of engineers and scientists to plan each day’s set of hundreds of individual commands, but these digital smarts help both missions get more done in less time.

“The idea behind PIXL’s adaptive sampling is to help scientists find the needle within a haystack of data, freeing up time and energy for them to focus on other things,” said Peter Lawson, who led the implementation of adaptive sampling before retiring from JPL. “Ultimately, it helps us gather the best science more quickly.”

Precision Positioning Using AI Technology

AI assists PIXL in two ways. First, it positions the instrument just right once the instrument is in the vicinity of a rock target. Located at the end of Perseverance’s robotic arm, the spectrometer sits on six tiny robotic legs, called a hexapod. PIXL’s camera repeatedly checks the distance between the instrument and a rock target to aid with positioning.

Temperature swings on Mars are large enough that Perseverance’s arm will expand or contract a microscopic amount, which can throw off PIXL’s aim. The hexapod automatically adjusts the instrument to get it exceptionally close without coming into contact with the rock.

“We have to make adjustments on the scale of micrometers to get the Creating Detailed Mineral Maps With AI

Once PIXL is in position, another AI system gets the chance to shine. PIXL scans a postage-stamp-size area of a rock, firing an X-ray beam thousands of times to create a grid of microscopic dots. Each dot reveals information about the chemical composition of the minerals present.

Minerals are crucial to answering key questions about Mars. Depending on the rock, scientists might be on the hunt for carbonates, which hide clues to how water may have formed the rock, or they may be looking for phosphates, which could have provided nutrients for microbes, if any were present in the Martian past.

Future Autonomy in Space Missions

There’s no way for scientists to know ahead of time which of the hundreds of X-ray zaps will turn up a particular mineral, but when the instrument finds certain minerals, it can automatically stop to gather more data — an action called a “long dwell.” As the system improves through rove and conduct science for the benefit of humanity.

NASA’s Perseverance Mars Rover

NASA’s Perseverance rover, part of the Mars 2020 mission, is one of the most advanced robotic explorers sent to the Red Planet. Launched on July 30, 2020, and landing on Mars on February 18, 2021, Perseverance’s primary mission is to search for signs of ancient life, collect and cache Martian rock and soil samples, and study Mars’ climate and geology.

The rover is equipped with a suite of scientific instruments to aid in its tasks, including cameras, spectrometers, environmental sensors, and ground-penetrating radars. One of its standout tools is the PIXL (Planetary Instrument for X-ray Lithochemistry), an X-ray fluorescence spectrometer that allows it to conduct detailed chemical analyses of Martian rocks at a microscopic scale.

Perseverance also carries the first helicopter, Ingenuity, to test powered flight on another planet, expanding the capabilities for future missions. Additionally, the rover serves as a vital precursor for future human missions to Mars, testing technology to extract oxygen from the Martian atmosphere and identifying other environmental conditions that will affect human life on Mars.

By functioning as a mobile laboratory, Perseverance is not only looking for evidence of past microbial life but also paving the way for future exploration, showcasing the integration of robotics, autonomous technology, and planetary science.