M2 Globular Cluster in Aquarius
Globular Clusters contain stars that share a common history-they are among the oldest objects within the galaxy . Most Globular clusters are thought to be 12-14 billion years old. They have eccentic orbits about the galactic center of 100 million light years or more. There are 147 catalogued clusters in the Milky Way. Almost all galaxies have been observed to have globular clusters. The stars are gravitationally bound and are highly concentrated as opposed to Open Clusters (see pictures of M35, M37, or the Double Cluster for examples of Open Clusters). The Summer time Milky Way is the best time to observe most gloubulars (see M13, M22). Clusters are great binocular and often naked eye objects to observe. The M2 and M15 clusters are almost twin-like and best observed during Fall. M2 is 37,000 ly away with 100,000 + stars. M15 is 31,000 ly distant and slightly larger than M2. Photographed in Colorado Springs with a Canon 10D and Brandon 130 f/8 apo just following the full moon.
M15 The Great Pegasus Cluster