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A black hole is a super dense object that has an intense gravitational pull. There are two parts to a black hole, a singularity and a event horizon. Most common theory is where a colossal star with a mass of more than 3 times the Sun’s reaches the end of its life, gets crushed under its own gravity, leaving behind a very black hole. Karl Schwarzschild is credited with being the brilliant astronomer who developed the concept of black holes. In 1916, using Einstein's general theory of relativity, he began to make calculations about the gravity fields of stars. He concluded that if a huge mass, such as a star, were to be concentrated down to the size of an infinitesimal point, the effects of Einstein's relativity would get really fairly extreme. Schwarzschild doubted that a star could get that small, and theorized that if a star did in fact shrink upon itself like that, its gravity would remain the same and the planets revolving around it would remain in the same orbits they always had. Since then however, some of Schwarzschild theories have been disproved, but most of his initial theories hold intact today. The Schwarzschild Radius, the maximum radius a body with a specific mass can have that won't let light escape, is named in his honor, and the equation of which is still in use today: Rs=2MG/(c^2) Black holes as Time Machines Some of the mathematical formulas associated with the theory of wormholes suggest that if one end of a hole is fixed and the other end is moving, each will end in a different time frame. In this excerpt from The Physics of Star Trek , physicist Lawrence M. Krauss tells how writers for Star Trek: Voyager correctly depicted this phenomenon. Wormholes, as glorious as they would be for tunneling through vast distances in space, have an even more remarkable potential, glimpsed most recently in the Voyager episode "Eye of the Needle." In this episode, the Voyager crew discovered a small wormhole leading back to their own "alpha quadrant" of the galaxy. After communicating through it, they found to their horror that it led not to the alpha quadrant they knew and loved but to the alpha quadrant of a generation earlier. The two ends of the wormhole connected space at two different times! Well, this is another one of those instances in which the Voyager writers got it right. If wormholes exist, they can well be time machines! This startling realization has grown over the last decade, as various theorists … began to investigate the physics of wormholes a little more seriously. If you were to take a slice of a black hole right through its center it would look like this The event horizon is where the force of gravity becomes so strong that even light is pulled into the black hole. Although the event horizon is part of a black hole, it is not a tangible object. If you were to fall into a black hole, it would be impossible for you to know when you hit the event horizon. For a mathematical derivation of the radius of a event horizon see below. Google.com Read more: http://www.scienceclarified.com/scite ch/Black-Holes/Can-Black-Holes-beUsed-as-CosmicGateways.html#ixzz132LX7qB9