- #26

- 26

- 3

_{ev}=5120*pi*G

^{2}M

^{2}/hc

^{4}

where G is the Gravitational constant, M is the mass of the black hole and h is planks constant and c is the speed of light.

A black hole with the mass of a small asteroid (radius of 120 meters) of 10

^{11}Kg would last 2.7 billion years so there could be many of these dangerous entities around and we wouldn't know until it was nearly upon us. Perhaps the only way to detect these is by occultation of starlight