In the late 1980s, Bodhan Paczynski of Princeton University and several other astronomers realized there was a way to detect unseen compact bodies that might be lurking in the halo of our galaxy. (discovermagazine.com)
The findings suggested that, with the standard theory of the big bang, there is not enough baryonic material to make the brown dwarfs that fill the haloes of all galaxies. (newscientist.com)
Globular clusters, which are found in the halo of a galaxy, contain considerably more stars and are much older than the less dense galactic, or open clusters, which are found in the disk. (sciencedaily.com)