Black holes
Evidence for Existence of a Black Hole
September 17, 2002 · NASA · M15, M31 G1
More Hubble images of M15, M31 G1
Using Spectroscopy to Measure Velocity DispersionSeptember 17, 2002
Relation of Black Hole Mass to Cluster MassSeptember 17, 2002
Relative Location of M15 and M31 G1September 17, 2002
Location of M15 and M31 G1 in the Northern Autumn SkySeptember 17, 2002
Globular Cluster M31 G1September 17, 2002
Location of Globular Cluster G1 in Galaxy M31September 17, 2002Black Hole in a Globular ClusterSeptember 17, 2002 · video
Space Science Update: Hubble Discovers Black Holes in Unexpected PlacesSeptember 17, 2002 · video