Dark matter nebula

Dark-matter nebulae are clouds of interstellar gas or dust which emit or reflect very little light or energy. Captain Jonathan Archer surveyed a dark-matter nebula in 2151. 

A second dark-matter nebula was observed by Captain Archer and Subcommander T'Pol in March of 2153. It was named the Robinson Nebula in honor of the late A.G. Robinson. 

The USS Voyager encountered trianic energy beings known as the Komar, who lived in a dark-matter nebula, in 2371. 

Neelix said that he once lost a warp nacelle on a ship he was piloting through a dark-matter nebula. 

An uncharted dark-matter nebula was located in Cardassian space, near the Dominion ketracel-white facility destroyed by Captain Benjamin Sisko and his crew in 2374. Captain Sisko had his ship enter the nebula to escape several pursuing Jem'Hadar warships. They later crashed on a rogue planet in the nebula.