User:Victoria7j/sandbox

                            The Event Horizon of a Black Hole

The place where light fails to be able to escape the gravity of a black hole At this point light may be in an orbit around the Black hole.

My math is not checked by any known authority.

A rough calculation of the event horizon is where light would travel in an orbit around a black hole For a Black hole about 15 times the mass of our sun, one friend calculates this to be about 48 km There is a known black hole of about this mass about 6,000 light years from the Earth This is one of the closest known black holes.

I tried to find out the relative mass of one kilogram sitting at this point All that I could find was the relative acceleration.

The effects of gravity on all objects near any star, including a black hole can also be calculated

the formula for calculating acceleration due to gravity: 

G is the universal gravitational constant, M is mass, and R is distance. (between objects)

g = G*M/R^2, where g is the acceleration due to gravity, G is the universal gravitational constant, M is mass, and R is distance.

 the acceleration of gravity on the surface of the earth at sea level is 9.8 m/s2.   on the Sun, that would be 273.7 meters/sec^2

Mass of Earth 5.972 × 10^24 kg 9.8 m/s2 Radius of Earth 6,371 Km Mass of Sun 1.989 × 10^30 kg 273.7 meters/sec^2 Radius of the Sun 696,000 kilometers