The observed evidence we have for black holes includes
A) visible light that is thought to come from the center of a black hole.
B) X-rays that are thought to come from the center of a black hole.
C) temperature measurement of certain extremely cold stars that are thought to be black holes.
D) X-rays that are thought to come from gases that are outside of a black hole.
E) observations of certain regions of space, larger than the largest known stars, that emit no light.

Question

Quizplus · Accepted Answer

X-rays are emitted by gases outside a black hole as they heat up while being pulled in by the black hole's gravity.

The Observed Evidence We Have for Black Holes Includes