Cool page! Thanks! So, if I have a black hole of 1,000 metric tons = 1,000,000 kg, the lifetime is only 84 seconds! A black hole whose lifetime is equal to that of the current age of the universe is approx. 1.7x10^8 metric tons = 1.7x10^11 kg. which isn't very big: about the mass of a small asteroid. At 02:47 PM 12/23/2012, Warren Smith wrote:

On 12/23/12, Henry Baker <hbaker1@pipeline.com> wrote:

...

Interesting calculation.

What's the situation with small black holes?

I understand that the really tiny ones evaporate pretty quickly due to Hawking radiation, but what about a Moon mass black hole?

--use http://xaonon.dyndns.org/hawking/