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- 1. (The burial of massive stars)
- 2. The name black hole was invented by John Archibald Wheeler . Before Wheeler came along, these objects were often referred to as frozen stars. The concept of black hole was first proposed by Pierre Simon Laplace in 1795. Using Newtons Theory of Gravitation ,Laplace calculated that if an object were compressed into a small enough radius, then the escape velocity of that object would be faster than the speed of light.
- 3. The velocity at which the body is thrown in such a way that it does not return again. This is the concept used for rocket propulsion. on earth it is 11.2 km/sec on moon it is 2.4 km/sec
- 4. In black holes theEscape velocity> 3,00,000 km/sec even light cann’t escape through it.
- 5. Stars rotate around the centers of galaxy with their own gravitational energy. When their energy comes to an end , they collapse in their own gravity . This forms a black hole.
- 6. Event horizon is a spherical surface that marks the boundary of the black hole . You can pass in through the horizon, but you cant get back out of it.
- 7. A typical mass for a black hole would be about 10 times the mass of the Sun, or about 10^{31} kilograms. (10,000,000,000,000,000,000,000,000,000, 000 kgs) Astronomers also suspect that the weight can be upto 10^{36} kgs.(a million times a sun) A black hole with a mass equal to that of the Sun would have a radius of 3 kilometers. So a typical 10-solar-mass black hole would have a radius of 30 kilometers .
- 8. Class Mass Size Supermassive ~105 - 109 Msun ~0.001–10 AUIntermediate-mass ~103 MSun ~103 km = REarthStellar-mass ~10 Msun ~30 kmPrimordial ~Mmoon ~0.1 mm
- 9. Astronomers are confident that our own Milky Way galaxy has a supermassive black hole at its center, in a region called Sagittarius A. A star called S2 (star) follows an elliptical orbit with a period of 15.2 years and a pericenter (closest) distance of 17 light hours from the central object.
- 10. The

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