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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:
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.
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