Globular cluster M30, at about 26,000 light years distance and about 90 light years across, and appears to us under an angular diameter of about 12.0 arc minutes. It is fairly dense, fairly bright, and a fine object in even small telescopes. It's most distinguishing feature are the 3 stellar spikes coming out from it. The core of M30 is extremely dense, and has undergone a core collapse, similar to at least 20 other of the 150 globulars in the Milky Way Galaxy, including M15, M70, and possibly M62. Consequently, M30's core is very small in extension, only about 0.12 arc minutes (7.2 arc seconds, corresponding to a linear diameter of 0.9 light years), and its half-mass radius is 1.15 arc min (8.7 light years); half of this cluster's mass is concentrated in a spherical volume of a radius equal to the distance of Sirius from us, or 17.4 light years diameter. On the other hand, its tidal radius is large: 18.34 arc minutes, corresponding to a linear radius of 139 light years.

10" F6.3 Schmidt Cassegrain Telescope, (1600mm F.L.) Modified Canon 300D camera with IR-UV filter, placed at the scopes prime focus
8 photos aligned and averaged together, then brightness, color, and contrast enhanced. Click on photo above for a full frame full rez image.
Each photo, 30 seconds exposure at ISO 800