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The pace of sound on Mars is continually altering, examine finds

June 19, 2024
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The pace of sound on Mars is continually altering, examine finds
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Researchers have teased out the small print of how sound behaves at numerous instances and locations on Mars — and the outcomes are very totally different from what we’re used to on Earth.

NASA’s Perseverance rover on Mars carries a number of microphones. These units, supposed to check the properties of supplies on the Pink Planet, have picked up all types of extra sounds, together with the eerie spluttering of Martian mud devils. 

Recordings have already proven that sound behaves peculiarly on Mars. As an illustration, noises beneath 240 hertz — roughly a piano’s center C — journey about 30 ft per second (10 meters per second) slower than higher-pitched sounds do. It’s because carbon dioxide molecules, which take in a few of sound’s power at low frequencies, make up 95% of Mars’ ambiance. Such weird properties, if unaccounted for, might compromise communications on future Mars missions, significantly crewed ones. 

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With this in thoughts, a crew of scientists from French and U.S. establishments got down to examine the pace of sound and its attenuation — its tendency to die down over distance — inside the first 60 ft (20 m) of Mars’ ambiance. 

To start, the crew collated values of various parameters — together with atmospheric strain, temperature and chemical composition — at numerous spots on the Pink Planet from the Mars Climate Database. Adjustments in these parameters can stretch or shrink sound waves, making these components important in predicting sound’s properties. 

Associated: NASA’s Perseverance Mars rover enters new Pink Planet territory: ‘Vibrant Angel’

The crew calculated sound pace and attenuation at totally different factors of time within the planet’s 12 months (which is about 687 Earth days) and in numerous spots throughout the Martian panorama, together with mountain peaks and valleys. This method was essential as a result of the underlying components range massively over area and time.  Within the polar areas, for instance, noon temperatures can fluctuate by 108 levels Fahrenheit (60 levels Celsius), and carbon dioxide ranges by 30%, throughout seasons. 

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A panorama of the surface of mars taken by NASA's curiousity rover

A composite panorama of Mars taken by NASA’s Curiosity rover at two totally different instances of day — 8:30 a.m. and 4:10 p.m., native Mars time. New analysis finds that sound strikes in another way at totally different instances of the day on Mars, in addition to at totally different instances of 12 months and at totally different areas.  (Picture credit score: ASA/JPL-Caltech)

The calculations turned up a number of fascinating findings, which have been revealed Could 7 within the JGR: Planets. For one, mud would not appear to have an effect on sound propagation, the authors mentioned in a joint e-mail to Stay Science — just like on Earth, the place a mud storm between you and an airport, for instance, would not hinder your potential to listen to the planes taking off. The change within the pace of sound with temperature (about 0.5 m/s for each diploma Celsius) can be just like that on Earth.

In contrast to on Earth, although, sound pace and attenuation rely vastly on carbon dioxide ranges. Moreover, whereas the pace of sound rises abruptly at round 240 hertz, the extent of the shift is much less pronounced at decrease temperatures than at increased ones.

The most important distinction from Earth, although, stems from the big fluctuations in temperature — and, to a lesser extent, the focus of carbon dioxide — day by day. Within the space the place the Perseverance rover presently dwells, as an illustration, mercury ranges change by about 90 levels Fahrenheit (50 levels Celsius) through the day. This causes sound to journey as much as 100 ft per second (30 m/s) and die down 3 times quicker within the hotter hours in contrast with the colder ones. Adjustments in temperature and carbon dioxide ranges additionally trigger variation in sound pace and attenuation throughout seasons, though this impact is extra pronounced within the polar areas. 

The outcomes permit scientists to “predict the sound pace and attenuation for any location on the Martian floor at any time of 12 months and any time of day,” the researchers advised Stay Science. The mannequin may also enhance scientists’ understanding of what sound-producing objects on Mars truly sound like. 

“We solely hear it [a sound] after the sound has propagated by means of the ambiance,” the authors mentioned. “Our mannequin might help to retrieve the traits of the unique sound sources.” 

Moreover, the mannequin offers a glimpse of life for future human residents on Mars: Mornings on mountaintops would be the closest factor to the way in which sound behaves on Earth. At different instances and locations, like afternoons on the Perseverance web site, a jarring impact will happen as high-pitched noises at shut distances attain the ears quicker than lower-pitched ones; extra distant noises ordinarily audible on Earth will not be heard in any respect.



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