M45 - The Pleiades
Copyright: Tad Denton/Adam Block/NOAO/AURA/NSF
The Pleiades is an open cluster of stars just over 400 light-years away in the constellation of Taurus. They can be seen in the night sky from early Autumn to early Spring. They are alternatively known as the Seven Sisters although more can be seen with the naked eye, and optical aid brings out dozens more. The true number of stars in the cluster is several hundred.