earthling<p>SNR G107.5-5.2, Unexpected Discovery (The Nereides Nebula in Cassiopeia), by Marcel Drechsler, Bray Falls, Yann Sainty, Nicolas Martino, Richard Galli</p><p>This photograph is the result of 3,559 frames, 260 hours of exposure time and telescopes on three continents. The team worked to explore and photograph a previously unknown gigantic supernova remnant in the centre of the constellation <a href="https://mastodon.social/tags/Cassiopeia" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Cassiopeia</span></a>. </p><p><span class="h-card" translate="no"><a href="https://a.gup.pe/u/photography" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@<span>photography</span></a></span> <br><a href="https://mastodon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophotography</span></a> <br><a href="https://mastodon.social/tags/NereidesNebula" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>NereidesNebula</span></a></p>