MadSci Network: Astronomy

Subject: Sphere of light around a black hole?

Date: Thu Oct 22 20:35:07 1998
Posted by Joe Leiman
Grade level: 10-12
School: Big Bear High Schoo;
City: Big Bear City State/Province: CA
Country: USA
Area of science: Astronomy
ID: 909106507.As

Does it make sense that a sphere of light would form around a black 
hole? If a photon was created exactly on the event horizon where the 
gravity of the black hole is equal to the velocity of light it should 
stay frozen in place. This is something interesting I thought up. 
Although this photon would have to be perpendicular to the center of 
gravity of the black hole, and any mass the black hole sucked in 
would widen the radius of the event horizon, sucking in the photon. 
It is also possible if the black hole's mass increased uniformly that 
the photon could be slightly outside the event horizon and move away 
from the black hole at the same rate as the event horizon.
Joe Leiman 10/22/98

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