Ring Nebula
From Memory Alpha, the free Star Trek reference
The Ring Nebula (NGC 6720) is a planetary nebula in the constellation of Lyra.
An image of the nebula was on display on one of the large bridge monitors aboard the USS Enterprise. (TOS: "Charlie X")
An image of the nebula, taken by the Hubble telescope, was on display in astrometrics aboard the USS Voyager in the year 2376. (VOY: "Alice")
