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Astronomy Picture of the Day

Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2025 April 6

Explanation: Why are there so many moonquakes? Analyses of left on the moon during the reveal a surprising number of s occurring within 100 kilometers of the surface. In fact, 62 were detected in data recorded between 1972 and 1977. are not only strong enough to in a , but the stiff rock of the moon continues to vibrate for many minutes, significantly longer than the softer rock on . The cause of the moonquakes remains unknown, but a include from -- and by -- our Earth. Regardless of the source, need to be built to withstand the frequent shakings. , astronaut stands beside a recently deployed , looking back toward the .

Authors & editors: () & ()
NASA Official: Amber Straughn .
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