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Period 3 A black hole is a place in space where gravity pulls so much that even light can not get out. What is a Black Hole? What does it look like? Don't let the name fool you: a black hole is anything but empty space. Rather, it is a great amount of matter packed into a very small area - think of a star ten times more massive than the Sun squeezed into a sphere approximately the diameter of New York City. The result is a gravitational field so strong that nothing, not even light, can escape. Tell me more! Although the term was not coined until 1967 by Princeton physicist John Wheeler, the idea of an object in space so massive and dense that light could not escape it has been around for centuries. Most famously, black holes were predicted by Einstein's theory of general relativity, which showed that when a massive star dies, it leaves behind a small, dense remnant core. How a Black Holes forms !
A star with a mass greater than about 20 times the mass of our Sun may produce a black hole at the end of its life.
In the normal life of a star there is a constant tug of war between gravity pulling in and pressure pushing out. Nuclear reactions in the core of the star produce enough energy and pressure to push outward. For most of a star’s life, gravity and pressure balance each other exactly, and so the star is stable. However, when a star runs out of nuclear fuel, gravity gets the upper hand and the material in the core is compressed even further. The more massive the core of the star, the greater the force of gravity that compresses the material, collapsing it under its own weight. Physics! It is impossible to find out what happens to any object or person that cross a certain point in the Black Hole. And the said object cannot comeback out once entered because it would need to move faster than light. Leaving a Black Hole? Haha Impossible! Since Black Holes have enough gravitational pull to pull in light, and since nothing can move faster than light, nothing can leave a black hole! A black hole is a point in space with so much gravity that not even light (the fastest thing around) can escape, hence the name. To an observer it would just appear as a sphere of perfect blackness. At the heart of a black hole is an object called a singularity, a point of zero size and infinite density, yes you have read that correctly, Zero Size and Infinite Density. I bet you are confused now! http://science.nasa.gov/astrophysics/focus-areas/black-holes/ http://www.physicsforidiots.com/blackholes.html http://www.nasa.gov/audience/forstudents/5-8/features/what-is-a-black-hole-58.html http://hubblesite.org/reference_desk/faq/answer.php.id=56&cat=exotic THE
END What is on the other side? And humanity has not created anything that can go the speed of light much less faster Confused yet? Questions? Thank You! Finding A Black Hole Scientists can't directly observe black holes with telescopes that detect x-rays, light, or other forms of electromagnetic radiation. We can, however, infer the presence of black holes and study them by detecting their effect on other matter nearby. http://science.nasa.gov/astrophysics/focus-areas/black-holes/ When the body is outside of the gravitational pull, its kinetic energy and potential energy will be 0, so if we equate them If the speed is high enough however it will keep going until it escapes the gravitational pull. For the earth the escape velocity is 12km/s or 26,843mph, for something bigger like the sun the escape velocity is 618km/s or 1,382,430mph. The Escape