LDN1373 Heart Nebula

LDN 1373 (Lynds’ Catalogue of Dark Nebulae, object 1373) is a dark nebula located in the constellation Cassiopeia. It is most notable for being a dense, light-blocking cloud of gas and dust situated in the heart of the larger Heart Nebula (IC 1805).
A dark nebula means it is a dense interstellar cloud that obscures the light from objects behind it, such as background stars or bright emission nebulae. It can be found within the Perseus Arm of the Milky Way; it lies at the centre of the massive IC 1805 star-forming complex.
Due to its silhouette, it is sometimes colloquially referred to as the Cosmic Bat or associated with the Fishhead Nebula area of the larger Heart structure.
LDN 1373 is an active star-forming region. While it appears black in visible light, infrared observations reveal new stars being born as dense clumps of material within the cloud that collapse under their own gravity. Like other molecular clouds, it is extremely cold (around 10 K) and composed primarily of molecular hydrogen, along with micron-sized grains of carbon and silicon.
The nebula spans approximately 2 light-years across and contains enough material to equal about 200 times the mass of our Sun.
The LDN 1373 is the visual opposite of the NGC 7023. It is a dark absorption nebula, while the NGC 7023 is a blue reflection nebula. Astronomers often image these objects together to showcase the contrast between glowing gas and the dark dust that carves shapes into the night sky.