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I.S blackholes

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Nick Chiccola

on 7 June 2010

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Transcript of I.S blackholes

Black Holes Nick chiccola Despite its invisible interior, a black hole can be observed through its interaction with other matter. A black hole can be inferred by tracking the movement of a group of stars that orbit a region in space. Alternatively, when gas falls into a stellar black hole from a companion star, the gas spirals inward, heating to very high temperatures and emitting large amounts of radiation that can be detected from earthbound and Earth-orbiting telescopes. The defining feature of a black hole is the appearance of an event horizon—a boundary in spacetime through which matter and light can only pass inward towards the mass of the black hole. Nothing, including light, can escape from inside the event horizon. The event horizon is referred to as such because if an event occurs within the boundary, light from that event cannot reach an outside observer, making it impossible to determine if such an event occurred Gravitational collapse occurs when an object's internal pressure is insufficient to resist the object's own gravity. For stars this usually occurs either because a star has too little "fuel" left to maintain its temperature, or because a star which would have been stable receives extra matter in a way which does not raise its core temperature. In either case the star's temperature is no longer high enough to prevent it from collapsing under its own weight Another possible way that a black hole may come to be is the result of a high speed, high energy, collision between multiple galaxies. Although an event of this magnitude has never been recorded, theoretically if the collision were to create a sufficient density a black hole would form. Growth in a black hole is a result of everthing that is "eaten" in it's lifetime. Although it is constantly absorbing particulate matter and interstellar dust around it, this will not cause a significant increase in mass. A theory states that whenever an object passes the event horizon, the event horizon expands to "swallow" it up. After the object has passed, the increase in mass is distributed equally within the entirety of the black hole. According to the general theory of relativity, a black hole is a region of space from which nothing, including light, can escape. It is the result of the deformation of spacetime caused by a very compact mass. Around a black hole there is an undetectable surface which marks the point of no return, called an event horizon. It is called "black" because it absorbs all the light that hits it, reflecting nothing. Creation of a black hole What is a black hole? How does it grow? Event Horizon? Gravitational Collapse Hawking Radiation Hawking radiation, discover by and named after british scientist Stephen hawking, is when a black hole actually loses some of its mass very slowly over a huge amount of time. Very little mass is lost, however if that value were to be greater than the mass being absorbed, then the black hole would eventually shrink and dissapate completely. So black holes have a finite lifespan. fuck fuck Well then. it would appear that a black hole has eaten my presentation....... The end.
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