Posted by: Mrs. Crews | 11/30/2009

No Escape: The Truth about Black Holes

No Escape: The Truth about Black Holes.

A black hole is an object whose gravity is so strong that its escape velocity exceeds the speed of light. Since nothing is known to exceed the speed of light, nothing can escape from a black hole.  We talked about the speed of light in class last week.  The speed light travels in empty space is 2.99793 X 108 m/s, or 186,000 miles/second.  That’s fast!  If it travels 186,000 miles per second, just imagine how far it would travel in a year.  That distance is the definition of  a light year.

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