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No one knows if there are spiders on Mars, but now we know that there might be "marsquakes."
For the first time, NASA's Mars InSight lander has successfully measured and recorded what seems to be a temblor on the red planet.
The seismic signal was detected and recorded on April 6 by the lander's Seismic Experiment for Interior Structure, otherwise known as SEIS instrument, according to NASA.… More