Black+Holes

Nick Callipari Josh Brown Black Holes are gigantic gravitional fields in space that appear after a star has died.
 * Black Holes**
 * What Are Black Hole?**

A Black Hole is a gravitational field which the gravitational pull is is so strong that not even light can escape from them. Black Holes have many unknown characteristics.
 * What Characteristics Does A Black Hole Have?**
 * Why do Black Holes occur?**

Black Holes are a natural disaster that only occur when a star has a supernova or dies. It is called "black" because it absorbs all the light that hits it, reflecting nothing.Quantum analysis of black holes shows them to possess a temperature and radiation.

A black hole can be inferred by tracking the movement of a group of stars that orbit a region in space which looks empty. Alternatively, one can see gas falling into a relatively small black hole, from a companion star. This gas spirals inward, heating up to very high temperatures and emitting large amounts of radiation that can be detected from earthbound and earth-orbiting telescopes. Simulation of Gravitational Lensing by a black hole which distorts the image of a galaxy in the background. **History Of Black Holes:**
 * What Roles Does The Black Hole Have?**

The idea of a body so massive that even light could not escape was put forward by geologist John Michell in a letter written to Henry Cavendish in 1783 to the Royal Society.

If the semi-diameter of a sphere of the same density as the Sun were to exceed that of the Sun in the proportion of 500 to 1, a body falling from an infinite height towards it would have acquired at its surface greater velocity than that of light, and consequently supposing light to be attracted by the same force in proportion to its vis inertiae, with other bodies, all light emitted from such a body would be made to return towards it by its own proper gravity.
 * The Letter:**