The spaceborne entities are creatures that are able to live and travel in the vacuum of space and have the ability to transform into a variety of other objects.
Its mate, transformed into a strange ship, fired on the neighboring "Old Bandi City" until the first entity was freed by the USS Enterprise-D. The two creatures left the system, destination unknown. (TNG: "Encounter at Farpoint")
In Orion's Hounds, part of the Star Trek: Titan novel series, the USS Titan under the command of William T. Riker encountered this species again. They were variously referred to as "star-jellies" by the Titan crew and "skymounts" by another species who used them as space-traveling vessels.