Black+Holes

Kim, Karina, Mike, Mary

__Black Holes__


 * Definition**: Concentrated areas of mass so immense that the force of gravity denies anything within a certain area around it for passing.


 * Interesting Information**:

Information from : http://cosmology.berkeley.edu/Education/BHfaq.html - It is believed that black holes are created by the collapse of a red super-giant star. - Black holes are an exception to the laws of Newton and Einstein because they are so massive. - A typical mass for such a stellar black hole would be about 10 times the mass of the Sun, or about 10^{31} Kilograms. - A black hole has a "horizon," which means a region from which you can't escape. Light cannot get past the horizon.

Information from : [|http://imagine.gsfc.nasa.gov/docs/science/know_l2/black_holes.html-] - As matter falls or is pulled towards the black hole, it gains kinetic energy, heats up and is squeezed by tidal forces. The heating ionizes the atoms, and when the atoms reach a few million degrees Kelvin, they emit X-rays. Thus we can see X-ray emission. - A binary system also allows the calculation of the black hole candidate's mass. Once the mass is found, it can be determined if the candidate is a neutron star or a black hole.

P4GB Black Hole info gravity assist period 4 ORBITING BODIES P4 Black Hole Period 4