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Do black holes live forever

Updated: 11/4/2022
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9y ago

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This answer depends on the size of the black hole. Black holes devour anything that falls onto the event horizon. As a black hole eats any and everything around it, it will grow. These black holes will exist as long as the universe exists. Small black holes do evaporate and disappear. This is because of something known as Hawking Radiation. Hawking Radiation is present in all Black Holes but its effects are inversely proportional to the mass of the black hole. This means that the larger the mass of the black hole the less the effect of the radiation is. A Black hole the mass of the Moon would evaporate almost instantly and the smaller the mass, the faster it will evaporate. You may think that a black hole that is larger but has nothing to consume will eventually evaporate, but you'd be wrong. Black Holes not only absorb stars and other objects, but it also feeds on the heat in space. Space is 2.7 kelvin, this is known as the Cosmic Microwave Background. A Black hole with a Solar mass of the sun will have a Hawking Temperature of about 100 Nanokelvins. This is far less then the 2.7 kelvins that space is. This is why large black holes will live as long as the universe itself, and small black holes such as those that could possibly be made with the Large Hadron Collider will never just stay open and consume the Earth. It is physically impossible due to the Hawking Radiation.

Answer #2. #1 is correct however I would like to correct the everlasting black holes bit. No black holes will last as long as the universe. Supermassives have the advantage of accreting from the CMB right now. As the CMB cools they'll get less and less energy. Eventualy it's gonna hit an equilibrium where they're radiating as much mass as they're gaining through the CMB, then the scales will tip and all black holes will start slowly evaporating like their stellar-sized cousins did, ableit vastly slower, unless they continue accreting matter. Problem is, when that happens, the universe will be essentially dead, there will be no more stars to eat. Just vast nothingness full of supermassive black holes slowly dying and drifting masses of carbon (Black dwarf stellar remnants). So basically, no black holes live forever.

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