by On September 18, 2021, NASA’s InSight lander celebrated its 1,000th Martian day by measuring one of the biggest, longest-lasting marsquakes its has ever detected; the event is estimated to be about a magnitude 4.2 and shook for nearly an hour-and-a-half; this is the third major marsquake it has detected in a month: on August 25, the lander detected two quakes of magnitudes 4.2 and 4.1.
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