出典:Wikipedia
出典:『Wikipedia』 (2011/05/26 03:10 UTC 版)
Messier 72 (also known as M72 or NGC 6981) is a globular cluster in the Aquarius constellation discovered by Pierre Méchain on August 29, 1780. Charles Messier looked for it on the following October 4 and 5, and included it in his catalog. Both decided that it was a faint nebula rather than a cluster.