Astronomy Picture of the Day<p>APOD from 2025-04-06</p><p>Moonquakes Surprisingly Common</p><p>Apollo seismometer data from 1972-77 detected 62 moonquakes near the surface, some strong enough to shift furniture. Unlike <a href="https://mastodon.bot/tags/Earth" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Earth</span></a>'s quakes, the <a href="https://mastodon.bot/tags/moon" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>moon</span></a>'s stiff rock vibrates longer. Causes may include Earth's tidal gravity and heat. Future <a href="https://mastodon.bot/tags/lunar" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>lunar</span></a> homes must be quake-resistant. Buzz Aldrin is shown with a seismometer in an image.</p><p>HD image at <a href="https://apod.nasa.gov/apod/ap250406.html#space" rel="nofollow noopener noreferrer" target="_blank"><span class="invisible">https://</span><span class="ellipsis">apod.nasa.gov/apod/ap250406.ht</span><span class="invisible">ml#space</span></a> <a href="https://mastodon.bot/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://mastodon.bot/tags/universe" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>universe</span></a></p>