NASA on Tuesday released two audio clips of seismic activity on Mars after an exquisitely sensitive "Marsquake" detector was set down on the planet's surface late last year. The quakes, far too quiet to be picked up by the human ear, were recorded by the Seismic Experiment for Interior Structure (SEIS) in May and July. Scientists hope that studying how seismic waves move through the planet's interior will reveal the deep inner structure of Mars for the first time. About 20 so-called "marsquakes" have been detected so far by the dome-shaped SEIS, which is carried by NASA's InSight lander that arrived on Mars in November. The audio -- a low, rumbling noise -- has been speed...
Keep on reading: A “Marsquake” Recording Released by NASA
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