M13, the Hercules Star Cluster

Globular star clusters are spheroidal masses of hundreds of thousands of ancient stars. About one hundred of these orbit our galaxy like gnats, and most of them are visible in amateur telescopes.

This was made with my 155mm refractor. In addition to the cluster itself, the faint galaxy NGC 6207 is visible on the far right. Between the two, and a little below, is the tiny wisp of IC4617, a galaxy so small and faint that I've never been able to see it in a telescope.

Image copyright by Joe Bergeron.