Comment on How would one exit a black hole?

db2@lemmy.world ⁨1⁩ ⁨month⁩ ago

• remon@ani.social ⁨1⁩ ⁨month⁩ ago

  You’re maybe thinking of white dwarfs. Black holes don’t do that.

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• victorz@lemmy.world ⁨1⁩ ⁨month⁩ ago

  Do they do that? Is that what the Big Bang was?

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  • remon@ani.social ⁨1⁩ ⁨month⁩ ago

    They don’t. They do evaporate though.

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    • Lumidaub@feddit.org ⁨1⁩ ⁨month⁩ ago

      That’s a hypothesis though, right? They haven’t detected any yet afaik (which the article could make clearer in its introduction).

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      • remon@ani.social ⁨1⁩ ⁨month⁩ ago

        Yeah, it mentions it at the end under the “Experimental observation” section.

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  • timroerstroem@feddit.dk ⁨1⁩ ⁨month⁩ ago

    More or less. In my layman’s understanding: Black holes ‘evaporate’ slowly through Hawking radiation, losing mass as a function of their surface area (simplistically, particle/anti-particle pairs ‘pop out of nothing’ near the event horizon, one gets swallowed up the other escapes, this means a net loss of energy, which has to ‘paid’ by the black hole losing mass, think E=mc^2^).

    Since a black hole behaves (geometrically) like any other sphere, the proportion of its area to its volume will grow as the black hole loses mass (i.e. it will have more and more relative area the smaller it gets), this process speeds up over time thus ending in what I guess you could call an explosion (more a whimper than a bang, to borrow a phrase).

    Part 2 of your question: We don’t know.

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    • meco03211@lemmy.world ⁨1⁩ ⁨month⁩ ago

      Wouldn’t the hawking radiation need to be a higher rate than the black hole is absorbing matter?

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      • remon@ani.social ⁨1⁩ ⁨month⁩ ago

        Yes, the effect is extremely tiny and easily canceled out when a black hole is “feeding”.

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      • rikudou@lemmings.world ⁨1⁩ ⁨month⁩ ago

        Which will eventually happen to all black holes because the last things remaining will be black holes, so there would be no matter to absorb.

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      • Ziggurat@jlai.lu ⁨1⁩ ⁨month⁩ ago

        Which is why it would work with a small black hole, but not with a large one

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• Tollana1234567@lemmy.today ⁨1⁩ ⁨month⁩ ago

  depends how close you are, and not getting spaghettified.

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