Astronomy Picture of the Day<p>APOD from 2025-04-16</p><p>Halo of the Cat's Eye</p><p>The Cat's Eye <a href="https://mastodon.bot/tags/Nebula" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Nebula</span></a> (NGC 6543) features a mysterious halo spanning over three light-years. Its origins are unclear, but it represents an advanced stage in the evolution of Sun-like stars. The nebula's outer halo is estimated to be 50,000 to 90,000 years old.</p><p>HD image at <a href="https://apod.nasa.gov/apod/ap250416.html#space" rel="nofollow noopener noreferrer" target="_blank"><span class="invisible">https://</span><span class="ellipsis">apod.nasa.gov/apod/ap250416.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></p>