Cosmozoan

Cosmozoans, the name used to describe the different type of interstellar dwelling species, that most of their lives live in the vacuum of space. They can be both sentient species as well as non-sentient animals or plants. The largest discovered is the size of a galaxy, comprised solely of carbon planets (NGC 6281). Other examples include:

• The Crystalline Entity (TNG:"The Silicon Avatar")
• "Junior", an orphaned lifeform found in the Alpha Omicron System by the USS Enterprise-D (TNG: "Galaxy's Child")
• Star Jellies (TNG: "Encounter at Farpoint")
• Gomtuu