black hole

A black hole is a region of space from which nothing, not even light, can escape. The theory of general relativity predicts that a sufficiently compact mass will deform spacetime to form a black hole. Around a black hole there is an undetectable surface called an event horizon that marks the point of no return. It is called "black" because it absorbs all the light that hits the horizon reflecting nothing just like a perfect black body in thermodynamics.Quantum mechanics predicts that black holes emitradiation like a black body with a finite temperature. This temperature is inversely proportional to the mass of the black hole, making it difficult to observe this radiation for black holes of stellar mass or greater.

Black holes of stellar mass are expected to form when heavy stars collapse in a supernoOOOOoooOOooOOOoooOOoOva * xD* at the end of their life cycle. After a black hole has formed it can continue to grow by absorbing mass from its surroundings. By absorbing other stars and merging with other black holes, supermassive black holes of millions of solar masses may be formed.

Simulation of gravitational lensing by a black hole, which distorts the image of a galaxy in the background 

gravitational lensing refers  to a distribution of matter between a distant source and an observer, that is capable of bending (lensing) the light from the source, as it travels towards the observer. This effect is known as gravitational lensing and is one of the predictions of Albert Einstein's



Only 2 days more of school:(