M10 is an old cluster, most of the stars, except the tiniest ones here, have burned up all or most of their hydrogen fuel. There are many red giants in the end phase, and blue stars now burning helium. M10 is about 14,500 light years away and about 85 light years wide. To us it appears a little brighter than the average globular, and extends out about 1/3rd the size of the moon.

10" F6.3 Schmidt Cassegrain Telescope, (1600mm F.L.)  Canon 300D camera placed at the scope's prime focus
5 photos aligned and averaged together, then brightness, color, and contrast enhanced. Click on photo above for a full frame full rez image.
Each photo, 180 seconds exposure at ISO 800