What Are The Black Holes?

A black hole is a place in space where the gravity is very strong. It pulls to the extend that nothing can escape from it including the light. Since the light cannot pass through a black a hole therefore a black hole cannot be seen. However a black hole can be spotted. It can be detected by looking at the movement of stars around it. As the gravity is very strong it affect the stars around it. By using certain types of telescope it can be observed that when the stars and the black holes are very close to each other a high energy light is made.

How Are The Black Holes Formed?

It is thought that a small black hole was formed in the beginning of the universe. Stellar black holes are formed when a big star collapses.

It is also thought that the supermassive black holes are formed at the same time as the galaxy they are in. 

Who Discovered The Black Holes?

There are sources which say that Albert Einstein predicted about the black holes while other sources say British astronomers  Louise Webster and Paul Murdin and American astronomer Thomas Bolton who was then a student at the University of Toronto, independently announced indication of black holes. Bolton however indicated the evidence of the Stellar black holes.

Is The Earth In Danger?

Nothing can escape from the black holes however the universe is big and it is expending. Even the black holes like the supermassive in which probably all or most of the stars nearby have fallen in it, it does not pose a threat to the Earth because the Earth is far away from it. The stars which are further away from the black holes are safe. The other thought is that since supermassive black holes have the mass of one millions Sun it will not increase greatly if few other stars as big as the Sun fall in it.