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Are black holes hot or cold?

Updated: 8/11/2023
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8y ago

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probably neither, since the gravity would crush you before you could feel it. and your head would explode if you didn't have a space suit on... but most people would just say " I don't know, I've never been in one."

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13y ago
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8y ago

Current theory indicates that black holes do have a small finite entropy and temperature consequential to principles of thermodynamics, attributed to quantum effects. Named after the astrophysicist that proposed it, this Hawking radiation can cause the mass of the black hole to slowly decrease and eventually the black hole may evaporate entirely. Because the radiation is very weak, black holes could generally be characterized as 'extremely cold,' mitigated only by this radiation. Also, the bigger the black hole the weaker this radiation is calculated to be, such that the largest black holes would be colder than even the very low cosmic background temperature.

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8y ago

Black holes themselves do not give off heat. However, if a large amount of matter falls into a black hole at once it will become extremely hot at emit very large amount of heat before passing the point of no return: the event horizon.

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8y ago

You can assign black holes a temperature according to their Hawking radiation. This makes them EXTREMELY COLD - a typical black hole would have a temperature less than a microkelvin. From Wikipedia: "... temperature inversely proportional to the mass of the black hole. ... A black hole of one solar mass has a temperature of only 60 nanokelvin."

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6y ago

Based on its Hawking radiation, a black hole is extremely cold for most of its lifetime. Somewhat less than a microkelvin, depending on its mass.

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