събота, 9 март 2013 г.

Black Hole

The black holes are the most mysterious objects in the universe. A long time thought to be just a theoretical entity, nowadays it is thought that there is a super massive black hole in nearly every galaxy in the universe.

In the center of a black hole the spacetime curvate becomes infinite. This is called singularity.

Black holes are born due to gravitational collapse of large stars at the end of their life. This happens because the internal pressure of an object cannot resist the objects' own gravity.

The defining feature of a black hole is the appearance of an event horizon. This is a boundary in spacetime through which matter and light can only pass inward towards the mass of the black hole. Nothing, not even light, can escape from inside the event horizon. The event horizon is referred to as such because if an event occurs within the boundary, information from that event cannot reach an outside observer, making it impossible to determine if such an event occurred.

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