Two NASA spacecraft at Mars - one on the surface and the other in orbit - have recorded the biggest meteor strikes and impact craters yet.
The high-speed barrages last year sent seismic waves rippling thousands of miles across Mars, the first ever detected near the surface of another planet, and carved out craters nearly 500 feet across, scientists reported Thursday in the journal Science.
Imaging the craters “would have been huge already,” but matching it to the seismic ripples was a bonus, said co-author Liliya Posiolova of Malin Space Science Systems in San Diego. “We were so lucky.” The impact observations come as InSight nears the end of its mission because of dwindling power, its solar panels blanketed by dust storms. InSight landed on the equatorial plains of Mars in 2018 and has since recorded more than 1,300 marsquakes.
The larger of the two struck last December some 2,200 miles from InSight, creating a crater roughly 70 feet deep. The orbiter's cameras showed debris hurled up to 25 miles from the impact, as well as white patches of ice around the crater, the most frozen water observed at such low latitudes, Posiolova said.
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