M92 is overshadowed by its big brother in Hercules M13, though it is a notable globular in its own right. It is about 28000 light years away, just a little further than M13. It appears to have a very dense condensation of stars at its core, which M13 lacks.
The two photographs are both digital images, taken through the same telescope with the same camera, a year apart. The second shows the result of a growing familiarity with this type of astroimaging, using focussing software to get the best from the camera and combining images of different exposure lengths to obtain detail in all areas of the image.