Black Hole's Gravity and Light
How can the gravity of a black hole pull light towards it?
Light follows a path which is the shortest distance between two
points in space-time. Gravitational fields are associated with
curvature of space-time. In the presence of a strong gravitational
field, light follows this curved space time. Thus the path of the
light deviates from what appears straight to "us", apparently
acted upon by the gravity.
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Update: June 2012