Crackerjack globular cluster M22 in Sagittarius. RGB 7 x 5 min per channel.

Many folk post globulars as a beautiful blue, but, at 10 billion years of age, that is impossible. Only small, cool, red stars can last that long. The smattering of blue stars are due to collisions. FLI PL16803 on 20 inch PlaneWave.