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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

2 Answers

5 votes

Answer:

4

Step-by-step explanation:

i took the test

User ZSG
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i believe it would be 4.bursts of light that release large amounts of radio waves precede the formation of a black hole
User Louis Maddox
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