US space agency NASA's newest Mars rover has sent back recordings of - bangs, pings and rattles- the first-ever sounds of driving on Mars.
The sounds were part of a 16-minute raw feed sent back by the Perseverance rover as it began rolling over the surface of Mars in its first test drive two weeks ago.
"A lot of people, when they see the images, don't appreciate that the wheels are metal," said Vandi Verma, a senior engineer and rover driver at NASA's Jet Propulsion Laboratory in Southern California. "When you're driving with these wheels on rocks, it's actually very noisy."
More than 16 minutes of sounds from Perseverance's 90-foot (27.3-meter) drive on March 7 were captured by the rover's entry, descent, and landing (EDL) microphone, which remains operational on the rover after its historic touchdown on February 18.
The off-the-shelf microphone was added to the rover to help take the public along for the ride during touchdown, but mission members have been eager to hear the sounds from the surface, too.
"If I heard these sounds driving my car, I'd pull over and call for a tow," said Dave Gruel, lead engineer for Mars 2020's EDL Camera and Microphone subsystem. "But if you take a minute to consider what you're hearing and where it was recorded, it makes perfect sense."
Two versions of the audio clip of the same drive were released to the public on March 17 where the first version features over 16 minutes of raw, unfiltered sounds of the rover traveling in Jezero Crater.
"In it, the noise generated by the interaction of Perseverance's mobility system (its wheels and suspension) with the surface can be heard, along with a high-pitched scratching noise. Perseverance's engineering team continues to evaluate the source of the scratching noise, which may either be electromagnetic interference from one of the rover's electronics boxes or interactions between the mobility system and the Martian surface," according to NASA.
The EDL microphone was not intended for surface operations and had limited testing in this configuration before launch.
The second version is a shorter compilation of sounds from the longer raw recording of the drive. For this 90-second version, NASA engineers combined three segments from the raw audio file processing and editing them to filter out some of the noise.
The SuperCam sounds were part of a series of systems checks the rover has gone through, ranging from the unstowing of Perseverance's massive robotic arm to making its first weather observations using the Mars Environmental Dynamics Analyzer.
The rover has also been searching for a suitable airfield for the Ingenuity Mars Helicopter to attempt its first flight tests. Now that the right spot has been found, the Perseverance and Ingenuity teams are making plans for the rover to deploy the helicopter, which will have 30 Martian days, or sols (31 Earth days), to complete up to five test flights.
And then the hunt for ancient life will begin in earnest, with Perseverance exploring terrain once thought to be covered with water. Between the rover's 19 cameras and its two microphones, the experience will be packed with sights and sounds.
For Ms Verma, who has helped "drive" NASA's last four Mars rovers, the audio is more than just cool.
"The variations between Earth and Mars - we have a feeling for that visually," she said. "But sound is a whole different dimension: to see the differences between Earth and Mars, and experience that environment more closely."
One of the objectives of the rover's mission on Mars is astrobiology, including the search for signs of ancient microbial life. The rover will characterize the planet's geology and past climate, 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 NASA missions, in cooperation with ESA (European Space Agency), would send spacecraft to Mars to collect these sealed samples from the surface and return them to Earth for in-depth analysis.
The Mars 2020 Perseverance mission is part of NASA''s Moon to Mars exploration approach, which includes Artemismissions to the Moon that will help prepare for human exploration of the Red Planet.
