HII region in the constellation Cassiopeia
via Wikipedia infobox
Heart Nebula as the brightest part of the W4 superbubble/chimney, as seen by the Northern Sky Narrowband Survey.
The Heart Nebula (also known as the Running Dog Nebula, Sharpless 2-190) is an emission nebula, 7,500 light-years (2,300 pc) away from Earth and located in the Perseus Arm of the Galaxy in the constellation Cassiopeia. It was discovered by William Herschel on 3 November 1787. In 1958, it was identified as a radio source by Gart Westerhout and is therefore also referred to as Westerhout 4 (or W4). It displays glowing ionized hydrogen gas and darker dust lanes.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).