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geo. project on black hole for …

geo. project on black hole for
first year BA students and for refference

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  • 1. BLACK HOLE A black hole is a dent in space whose gravational forece is so intense that nothing can escape its pull not even light or electro magnetic radiation . These are formed when a stars fuel get over and gravity takes control over it because of it ther is a explosin and a black hole is formed
  • 2. There are 2 types of confirmed black holes and one theoretical type 1. STEELAR BLACK HOLE: these black holes are mostly found inside the galaxy . When this star dies the explosion is called supernova 2. SUPER MASSIVE BLACK HOLE: These black holes are formed when a very big star approx. 200 million times the size of sun dies . The explosion of this star is called a hyper nova the black hole are mostly at the center of every galaxy and are very important for the existence of galaxies  PIN POINT BLACK HOLE: this is a therotical type . Stephen hawkings gave the theory but in present this blach hole is not confirmed HOW MANY BLACK HOLES ARE THERE
  • 3. FORMATION OF A BLACK HOLE  When a gigantic star reaches the final stage of its life and is about to go supernova (which normally takes billions of years), it spends all the nuclear fuel by then. So it stops burning and heating up and cannot create the nuclear energy required to feed the star and let it make a pivotal balance to support its own gravitational draw against the intense pressures brewing inside.  its stability cracks under its own gravity.  The radius of the star shrinks to a critical size, called the Schwarzschild radius .  The outer shells of the star explode into the space. They may even fall into the already dense black hole making it even heavier and denser. And that’s how you get a stellar mass black hole.
  • 4. HOW BIG ARE BLACK HOLES  Black holes can be big or small. Scientists think the smallest black holes are as small as just one atom. These black holes are very tiny but have the mass of a large mountain. Mass is the amount of matter, or "stuff," in an object.  Another kind of black hole is called "stellar." Its mass can be up to 20 times more than the mass of the sun. There may be many, many stellar mass black holes in Earth's galaxy. Earth's galaxy is called the Milky Way.  The largest black holes are called "supermassive." These black holes have masses that are more than 1 million suns together. Scientists have found proof that every large galaxy contains a supermassive black hole at its center. The supermassive black hole at the center of the Milky Way galaxy is called Sagittarius A. It has a mass equal to about 4 million suns and would fit inside a very large ball that could hold a few million Earths.
  • 5. IF BLACK HOLES ARE “BLACK” HOW DO SCIENTISTS KNOW THEY ARE THERE ?  
  • 6. COULD A BLACK HOLE DISTROY EARTH  .  Even if a black hole the same mass as the sun were to take the place of the sun, Earth still would not fall in. The black hole would have the same gravity as the sun. Earth and the other planets would orbit the black hole as they orbit the sun now.  The sun will never turn into a black hole. The sun is not a big enough star to make a black hole.
  • 7. THE END