M15, also designated NGC 7078, is a globular cluster located in the constellation Pegasus.  It was first discovered by Jean-Dominique Maraldi in 1746 and included in Charles Messier's catalogue of comet-like objects in 1764. It's distance from Earth is about 33,600 light-years and is one of the most densely packed globular clusters in the Milky Way.   M15's age is an estimated 13.2 billion years old, also making it one of the oldest known globular clusters.

http://en.wikipedia.org/wiki/Messier_15 

ABOUT THIS IMAGE

DATE/TIME:  The evening of July 20th 2009

CAMERA:  Canon XSI, 450D

TELESCOPE:  Orion 100mm ED refractor @ F/18

ISO SETTING:  800

EXPOSURES:  45

EXPOSURE LENGTH:  100sec

TOTAL EXPOSURE LENGTH:  1hr, 15min

CAPTURE SOFTWARE:  MaximDL

STACKING SOFTWARE:  Deep Sky Stacker

PROCESSING:  Photoshop CS3