vttoth.com/…/311-hawking-radiation-calculator
Indeed, any black hole with a mass greater than about 0.75% of the Earth’s mass is colder than the cosmic background, and thus its mass increases for now. As the universe expands and cools, however, eventually the black hole may begin to lose mass-energy through Hawking radiation.
Size isn’t the main factor, mass is.
A teaspoon of what neutron stars are made of weighs as much as Mt. Everest.
Its the mass, and apparently the threshold for an actually stable black hole is 0.75% the mass of Earth, 4.48 x 10²² kg … or, roughly 2/3 the mass of the Moon.
So… basically 0 chance in our natural life times we’ll figure out how to convert the Moon into a blackhole, lol.
DogWater@lemmy.world 1 year ago
I know a little bit but I’m not an expert.
My understanding is hawking radiation will produce a rate of mass evaporating that’s fairly consistent over galactic time scales, so you just need to make sure the black hole is big enough to “suck” more mass in via gravitational attraction per given time period than evaporates through hawking radiation.
interdimensionalmeme@lemmy.ml 1 year ago
I think the bigger they are faster tge evaporate. They lose mass at some ratio between their surface and mass.
WiseThat@lemmy.ca 1 year ago
Exactly the opposite. The bigger one is, the less it evaporates. Time required to evaporate scales with Mass^3
DogWater@lemmy.world 1 year ago
That’s true the constant rate I mentioned would vary with the surface area of the black hole as it changes but the volume would increase exponentially faster