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Black Holes

If theories of their existence are true,
black holes are the most powerful force in the
known physical universe. Many people are familiar
with the term black hole, but few people actually
know anything about them. A black hole forms as
a result of a massive star running out of fuel to
burn (Chaisson, 193). Once the star is no longer
exerting outward force by burning off gases, it
begins to collapse under its own intense, inward
gravity (Chaisson, 193). It is like slowly letting the
air out of a balloon. Once the star is compacted to
a certain size, while its mass, or weight, remains
the same, its gravity becomes so powerful that
nothing can escape it (Hawking, 87). This critical
size to weight ratio is known as the Schwarzchild
Radius (Hawking, 87). Once a black hole is
created in this way, an invisible area, or line
around it exists. If any object crosses this line, it
can no longer escape the gravitational force of the
black hole (Hawking, 87). This line is called the
event horizon (Hawking, 87). If black holes are
proven to exist, beyond theoretical physics, then
they would probably be a very common anomaly
in this universe. In 1915, Albert Einstein put forth
the first real proposition of such an anomaly in his
Theory of Relativity (Bunn, Black Holes FAQ).

In the 1930s, three physicists, doctors Volkoff,
Snyder and Oppenheimer, were able to prove the
validity of black holes mathematically. Since then,
black holes have become a very important and
integral part of science and the over all
understanding of the universe. It has been proven,
mathematically, that black holes have infinite,
gravity based, escape velocities and an immense
effect on light, time and even the very fabric of
space. All bodies in space have gravity. According
to Einsteins Theory of Relativity, this is because
bodies with a large mass, or weight, actually warp
space (Chaisson, 77). For example, if a two
dimensional sheet of cloth, stretched and
suspended at four corners, represents space, and
a bowling ball is placed in the center, the sheet will
warp downward. If a golf ball is then set at the
edge of the sheet and allowed to move freely it will
be attracted toward the bowling ball, unless the
golf ball is traveling at a speed great enough to not
be effected by the curve. This critical speed is
known as an escape velocity. This is the speed at
which an object must travel to escape a bodys
gravitational force (Chaisson, 77). If a body is
compacted, such that its weight stays the same
but its radius, or size, becomes smaller, its
escape velocity increases in parallel (Chaisson,
196). The simple formula for this, in physics, states
that a bodys escape velocity is equal to the
square root of its mass, divided by its radius
(Chaisson, 77). For example, if a bodys mass is
two-hundred, and its size is twelve and one half,
the escape velocity would be four. If the size of
the same body is reduced to two, while its mass
remained at two-hundred, the escape velocity
increases to ten. Since a black holes size is
always decreasing and its weight is always the
same, the escape velocity is infinite (Chaisson,
195). This means that nothing can escape a black
hole past the event horizon, not even light. Light is
made up of waves and particles. It was
discovered, in 1676, by Danish astronomer, Ole
Christenson, that light travels at a very high, but
finite speed (Hawking, 18). These properties of
light govern that it must be subject to forces of
nature, such as gravity. Light travels at such a high
speed that it is not observably effected by gravity,
unless that gravity is very strong. A black holes
gravity is powerful enough to trap light because its
escape velocity, being infinite, exceeds the speed
of light (Hawking, 82). This is why a black hole is
black. Once light crosses the event horizon it is
drawn into the hole in space. Although the light is
still hitting objects, it is not able to bounce off to
indicate their existence to an observer, therefor the
black hole appears as a void in space. Closing in
on the edge of the event horizon, light travels back
to an observer at a slower and slower rate, until it
finally becomes invisible. This is due to heavy
gravity and the effect that a black hole has on time
(Bunn, Black Holes FAQ). According to
Einsteins General Theory of Relativity, time is
not a constant (Hawking, 86). Time is relative to
an observer and his or her environment (Hawking,
86). It has been proven that time moves slower at
higher speeds (Hawking,

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