Mars probe records a big hour-and-a-half Martian quake

Mars is alive. (Geologically.) NASA recently reported that its InSight lander — sent to observe geologic activity beneath the Martian surface — recorded one of its biggest quakes yet on Sept. 18. The 4.2 temblor, a quake that would have been big enough for people to feel had it happened on Earth, lasted an hour-and-a-half. NASA said the event was "one of the biggest, longest-lasting marsquakes the mission has ever detected." The agency also noted that the 4.2 quake was the third "major" quake InSight has observed in the last month. Both a 4.2 and 4.1 magnitude quake hit on Aug. 25. The InSight ...

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