Black Holes
In simplest terms a black hole is an area of space that has so much mass concentrated in it that there is no way for nearby objects to escape its gravitational pull. To understand the magnitude of this gravitational pull we need to explore our best theory of gravity, at the present moment, Einstein's general theory of relativity. His premise states that anything with mass will bend the fabric of space and time. The greater the mass the more distortion in the fabric of the universe. Imagine the universe as a giant rubber sheet with objects, varying in weight, placed upon it, representing planets, asteroids, moons, etc. The objects with greater mass distort the fabric more and hence have a stronger gravitational field. For another object to escape the pull it must achieve something called escape velocity. Escape velocity is the speed you must achieve to get away from a planet and into space. The earth escape velocity is 25,000 mph, while the moon, with a smaller mass, is about 5,300 mph. A black hole has such a large concentration of mass in such a small area that the escape velocity is faster than the speed of light. Then, since nothing travels faster than light, nothing can escape a black holes gravitational field. Even a beam of
As I stated before a black hole is a mass in space where the gravitational pull is so strong that nothing, not even light can escape. So how do you find, or even see, something like this (http://www.geocities.com)? In the strictest scientific terms, to prove something you must absolutely, positively show that what you've seen matches exactly the properties of your theory, and that there is no other possible explanation. In reality scientist work in a much less demanding atmosphere, shaped by observation and consensus. As for black holes scientists predict them using Einstein's general theory of relativity. And even though you can't see them there are many ways to detect them. One way is through X-ray astronomy. Circling around black holes are a lot of dust and other particle in something called an accretion disc. And it just so happens that these are readily visible with an X-ray telescope. The observer would see an enormous amount of X-ray light with a very small force, that tells them that what they are looking at could in fact be a black hole. Another, more complicated, method of finding them is called the Shifting. In shifting there are two possible ways that this method can be performed. One can only occur when a black hole is moving towards you. In doing this it emits red lights that are viewable only with a light telescope of an extremely high power. Astronomers have made great advances in this particular method since the Hubble Telescope. This moving of a black hole is called a blue shift. When the black hole is moving away a blue light is emitted only visible with X-ray telescopes. This is called a red shift. It is important to note that the light doesn't come from the black hole itself, but is created by the energy released by the astronomical speed at which the black hole is moving towards or away from you (http://web.singnet.com). Inte
Some common words found in the essay are:
, Hubble Telescope, black hole, black holes, event horizon, gravitational pull, escape velocity, light rays, einstein's theory relativity, black hole moving, theory relativity, einstein's theory, hole moving, photon sphere, escape gravitational pull, types black holes, hole moving towards,
Approximate Word count = 1256
Approximate Pages = 5 (250 words per page double spaced)
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