Globular clusters are very tighly bound, spherical collections of stars that orbit the galactic core in a satellite relationship. Globular clusters, which are found in the halo of a galaxy, contain many more stars and are much older than the less dense open cluster, which are found within the substance proper of the galaxy.
According to some sources, the Milky Way contains about 150 globular clusters. Larger galaxies like M31 in Andromeda may contain as many as 500, and some giant elliptical galaxies like M87 may contain 10,000 of these tightly bound clots of stars.
Globuar clusters contain, generally, the oldest stars in the galaxy.
Earlier images are taken on an Atlas EQ-G mount with EQMOD software and an EQDIR adapter using PHD guiding.
© Hunter Wilson
