What makes astronomers think there are black holes in space?
1. When galaxies dissapear, they stop emitting infrared radiation, and a hole in space is formed
2. There are areas of space from which no electromagnetic energy of any kind has been deleted
3. At the end of a star's life cycle, it runs out of hydrogen and stops emitting visible light
4. Bursts of light that release large amounts of radio waves precede the formation of a black hole
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