The Perseverance mission captured sound with microphones for the first time on Mars. A new study reveals some surprising findings about these acoustics and sound behavior.
It took some coaxing to convince NASA that the microphones were a worthwhile addition to Perseverance’s payload, says Baptiste Chide, one of the study’s lead authors and a postdoc at the Los Alamos National Laboratory.
Without the bustle of humans and animals, Mars is nearly silent, save the gusty wind. So, the SuperCam team also decided to analyze the sounds coming from their own scientific equipment. Chide says that this difference in speed between low and high frequencies would be most apparent at long distances. If you were to attend a concert on Mars, for example, and stand a few hundred feet away from the stage, you would receive the high frequencies a few milliseconds before the low ones, which would lead to sound distortion. The band would also have to play quite loud in order for the music to reach you because sounds on Mars don’t carry nearly as far as they do on Earth.
Given that temperature has such a drastic effect on sound propagation, Chide and his colleagues suspect that the speed of sound on Mars will vary by season and even time of day. As the dust storm season approaches, the researchers anticipate their microphones will detect additional wind and temperature changes. SuperCam’s mic has unprecedented sensitivity, and can detect pressure fluctuations at scales 1,000 times smaller than ever before recorded on Mars.
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