Messier's catalog does not contain any dark nebula.
The icon shows the Horsehead Nebula
Besides the luminous bright nebulae of various types, consisting of light
emitting gas or illuminated dust masses, there are dark nebulae which can be seen
because they obscure, or absorb, the light coming from stars or bright nebulae
behind them. Therefore, dark Nebulae are sometimes called Absorption Nebulae.
A famous example is the Horsehead Nebula.
Last Modification: January 25, 1998