NASA’s Perseverance rover has provided scientists with unprecedented insights into the acoustic environment of the Red Planet, utilizing its onboard SuperCam microphone to record audio data from the Jezero Crater Spacedaily. By Sol 216, the equipment had captured four hours and 40 minutes of audio, encompassing the whir of the Ingenuity helicopter’s rotors and the crackle of the rover’s laser striking rocks Spacedaily.
Unveiling the Unique Acoustic Environment of Mars
The initial recordings demonstrated that Mars is an exceptionally quiet world. Sylvestre Maurice, an astrophysicist at the University of Toulouse who led the analysis, noted that operators initially thought the microphone was broken due to the profound silence Spacedaily. Co-author Baptiste Chide of Los Alamos National Laboratory attributed the quietness to low atmospheric pressure, explaining that surface pressure sits at about 0.6 kilopascals—less than one percent of Earth’s sea-level pressure—leaving far less air to carry vibrations Spacedaily. The team published the first comprehensive description of the Martian soundscape in Nature on April 1, 2022 Spacedaily.
Discovery of Two-Speed Sound
Among the central surprises of the acoustic data was the discovery of two distinct speeds of sound on Mars Spacedaily. On Earth, sound travels at roughly 343 meters per second, and its speed near the surface does not vary meaningfully with frequency across the audible range Spacedaily. Mars breaks that rule Spacedaily.
Using helicopter rotors and laser-generated sparks as point sources, researchers measured a speed of about 240 meters per second for lower sounds and approximately 250 meters per second for higher sounds Spacedaily. The dividing line between these two speeds sits at around 240 hertz, a pitch slightly below middle C Spacedaily. Consequently, high-pitched parts of a sound travel roughly ten meters a second faster than lower components Spacedaily.
How Conversation and Music Change on the Red Planet
While a ten-meter-per-second gap is minor over a short distance, high and low frequencies pull further out of step over longer ranges Spacedaily. Moreover, molecular physics contributes to strong attenuation, while atmospheric viscosity heavily damps frequencies above a few kilohertz Spacedaily.
NASA states that sound falters at about eight meters on Mars, with high-pitched sounds lost completely at that distance Spacedaily. A nearby voice sounds quieter and duller, with consonants stripped of much of their crispness Spacedaily. Music would fare similarly; Maurice noted that listening to music on Mars would be very strange because chords contain many frequencies at once, and the higher ones would travel slightly faster but fade more quickly than the bass Spacedaily.
Broader Acoustic Discoveries
Beyond atmospheric sound speeds, Perseverance’s microphone has captured other rare events, including the sound of a dust devil aljazeeranews-mggx1uo47w.edgeone.app and the rolling noise of the rover’s metal wheels 9h2d26w6.thepostpedia.com. The study on acoustic data revealed that sound measurements can examine pressure variations at scales up to 1,000 times smaller than previously observed, providing researchers with a new investigative tool Spacedaily.
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