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enmacdee t1_iucmm9v wrote

Reply to comment by Aseyhe in Is dark matter orbiting galaxies with the same speed as normal matter? by taracus

Unrelated question. But how can you have a black hole of mass earth or asteroid. Isn’t the whole idea of a black hole that the gravity is so strong it bends light. If something only has the same mass as the earth how is it able to bend light? Thanks!

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Aseyhe t1_iucns8k wrote

You can make almost anything a black hole if you compress it small enough. If you compressed the earth down to about a centimeter, it would become a black hole. For a 10^20 gram asteroid, the relevant size is under a nanometer.

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