# Can a 1kg black hole exist?

And if so what would happen if it would be created on earth is there any way to push it out of the orbit could you actually manipulate such a small black hole?

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Ryan_m_b
Staff Emeritus
A black hole can be of any size but a 1kg black hole will evaporate long before you can move it. Unless it fell through the floor and ate enough of the world per second to over come its evaporation.

As for moving a black hole theres I'm not sure if perhaps just chucking mass at it will result in it moving. Not my field though

Janus
Staff Emeritus
Gold Member
A black hole can be of any size but a 1kg black hole will evaporate long before you can move it. Unless it fell through the floor and ate enough of the world per second to over come its evaporation.
That probably wouldn't even be enough. The estimated exaporation time of a 1 kg BH is 1.44e-17 sec. It would radiating energy away at a rate of 3.6e32 joules/sec, and thus would have to eat matter at a rate of ~4e15 kg/sec just to keep up with the loss.

It would indeed evaporate VERY quickly. Moving a black hole can indeed be done by throwing mass on it from a certain direction, as the total momentum of the system needs to be conserved. For a 1 kg black hole this si still easy (if it wouldn't evaporate), more massive ones are going to need excessive amounts of mass...

A one kilogram blackhole can exist. But it will be microscopic, perhaps even smaller than an electron! Anything can be made into a blackhole there is enough mass in an extremely small amount of space. In other words, any squeezed down enough would turn into a blackhole. The planet Earth weighs much, much more than one kilogram. Earth would turn into a blackhole if it was squeezed down into the size of a marble. So just imagine how much you would have to squeeze down a one kilogram mass to turn it into a blackhole? That's why I said it's microscopic.

jambaugh