Globular star clusters are collections of stars arranged in a roughly spherical shape because they're so tightly bound by gravity. They're some of the oldest astronomical objects known.
The dense globular cluster M15 is one of about 170 globular star clusters that still roam the halo of the Milky Way and is about 13 billion years old. Hubble-based measurements of the increasing velocities of M15's central stars are evidence that a massive black hole resides at the center of dense globular cluster M15.
Image Credit & Copyright: Bernhard Hubl (CEDIC)
No comments:
Post a Comment