M13 - Great Globular Cluster in Hercules
[M13] is one of the best known clusters of the northern hemisphere. It is some 25,100 light years away with a diameter of 145 light years and as such is orbiting around the Galaxy as a satellite. It is a collection of stars that are gravitationally held together and most stars are at a similar point in their stellar evolution.It is, however, unclear whether the stars formed in one generation or are from multiple generations. Some 150 globular clusters are know to orbit the Milky Way (our galaxy) and I think M13 is probably the most striking. It is a good binocular object appearing as a large, diffuse but bright ball forming he point of a triangle with some outer stars probably resolved.
