Gaseous anomaly

A gaseous anomaly was a type of interstellar phenomenon.

In 2290, the USS Excelsior began a three year mission to catalog gaseous anomalies in the Beta Quadrant. The USS Enterprise (NCC-1701-A) had been equipped with technology to do the same by 2293. 

In 2370, Romulan Commander Sirol claimed the Terix was conducting a survey on gaseous anomalies in the Devolin system, although they were actually searching for the USS Pegasus. 

Gasachtige anomalie