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NASA’s Perseverance rover to use X-rays to hunt Martian fossils

Stephen Kuper

NASA’s recently launched Perseverance rover will make use of PIXL, an instrument at the end of the rovers arm to search for the chemical fingerprints left by ancient microbes – with similar rocks found in Australia informing the search for ancient fossils.

NASA’s Perseverance rover to use X-rays to hunt Martian fossils
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NASA's Mars 2020 Perseverance rover has a challenging road ahead: after having to make it through the harrowing entry, descent and landing phase of the mission on 18 February 2021, it will begin searching for traces of microscopic life from billions of years back – that's why it's packing PIXL, a precision X-ray device powered by artificial intelligence (AI).

Short for Planetary Instrument for X-ray Lithochemistry, PIXL is a lunchbox-size instrument located on the end of Perseverance's two-metre-long robotic arm.

The rover's most important samples will be collected by a coring drill on the end of the arm, then stashed in metal tubes that Perseverance will deposit on the surface for return to Earth by a future mission.

Abigail Allwood, PIXL's principal investigator at NASA's Jet Propulsion Laboratory in southern California, said, "PIXL's X-ray beam is so narrow that it can pinpoint features as small as a grain of salt. That allows us to very accurately tie chemicals we detect to specific textures in a rock."

Nearly every mission that has successfully landed on Mars, from the Viking landers to the Curiosity rover, has included an X-ray fluorescence spectrometer of some kind.

One major way PIXL differs from its predecessors is in its ability to scan rock using a powerful, finely-focused X-ray beam to discover where – and in what quantity chemicals are distributed across the surface.

Rock textures will be an essential clue when deciding which samples are worth returning to Earth. On our planet, distinctively warped rocks called stromatolites were made from ancient layers of bacteria, and they are just one example of fossilised ancient life that scientists will be looking for.

To help find the best targets, PIXL relies on more than a precision X-ray beam alone. It also needs a hexapod a device featuring six mechanical legs connecting PIXL to the robotic arm and guided by artificial intelligence to get the most accurate aim.

After the rover's arm is placed close to an interesting rock, PIXL uses a camera and laser to calculate its distance. Following this, those legs make tiny movements  on the order of just 100 microns, or about twice the width of a human hair so the device can scan the target, mapping the chemicals found within a postage stamp-size area.

Allwood added, "The hexapod figures out on its own how to point and extend its legs even closer to a rock target. It's kind of like a little robot who has made itself at home on the end of the rover's arm."

Then PIXL measures X-rays in 10-second bursts from a single point on a rock before the instrument tilts 100 microns and takes another measurement. To produce one of those postage stamp-size chemical maps, it may need to do this thousands of times over the course of as many as eight or nine hours.

That timeframe is partly what makes PIXL's microscopic adjustments so critical: The temperature on Mars changes by more than 38 degrees over the course of a day, causing the metal on Perseverance's robotic arm to expand and contract by as much as 13 millimetres.

To minimise the thermal contractions PIXL has to contend with, the instrument will conduct its science after the sun sets.

For astrobiologists, X-ray fluorescence is a way to read stories left by the ancient past. Allwood used it to determine that stromatolite rocks found in her native country of Australia are some of the oldest microbial fossils on Earth, dating back 3.5 billion years.

Mapping out the chemistry in rock textures with PIXL will offer scientists clues to interpret whether a sample could be a fossilised microbe.

A key objective for Perseverance's mission on Mars is astrobiology, including the search for signs of ancient microbial life. The rover will also charactersae the planet's climate and geology, pave the way for human exploration of the Red Planet, and be the first planetary mission to collect and cache Martian rock and regolith (broken rock and dust).

Subsequent missions, currently under consideration by NASA in cooperation with 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.

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