May 2
Star Cluster M15
Observed in 2006
This dense cluster of stars is known as Messier 15 (or M15) and is located about 35,000 light-years away. The fuzzy, blue area to the left of the cluster's core is a planetary nebula, a cloud of gas that has been cast off by a dying, medium-sized star.
Image credit: NASA, ESA, Hubble Space Telescope