Barnard 335, also known as LDN 663, is a small, very dense dark nebula about 536.22 light-years away in the constellation Aquila. It is considered to be a Bok globule, which are extremely dark areas in space that reach temperatures as low as 10 Kelvin
Barnard 335 is that dark "cloud" in the center, with the Milky Way as its background to make it more visible
Barnard 335 as seen through a telescope (Source: Cosmoquest Forums)