Nina Lanza: We put together a list of some of the sounds we've recorded on Mars to date. So you tend to hear the lower frequencies and it's a much more isolated sound, a little more muted than the sounds we hear on earth. On Mars the atmosphere attenuates a lot of those higher frequencies. It gets a really nice depth to the sound. Sounds on earth have very rich harmonics. Justin Maki: There's a difference between Mars and earth sounds. And finally, we can also listen to the sounds the rover makes to understand better the state of health of our instruments. Nina Lanza: First, we can just learn about the atmosphere by understanding how sound propagates through it, but we can also listen to the sounds of rover analyses on rocks and learn about rock material properties from that. Justin Maki: It gives us a new dimension for which we can explore Mars and learn about the Martian environment. So these are things that you could just buy on the internet and we put these on our rover. Nina Lanza: The two microphones that we sent were commercial off-the-shelf items. The other microphone is mounted to the rover body and it stays fixed onto the port side of the rover. One of the microphones is mounted on the mast and moves around as we point the cameras. Justin Maki: Hi, I'm Justin Maki, an imaging scientist at NASA's Jet Propulsion Laboratory. I'm Nina Lanza, and I'm a scientist at Los Alamos National Laboratory. And these microphones are the very first instruments of their kind ever to go to Mars. Nina Lanza: On NASA's Perseverance Mars rover, we have not one but two microphones.
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