1. It was already clear that a uniform spherical star would contract to a point of infinite density, a singularity.
2. Einstein’s Theory of General Relativity says that objects distort the space-time around them.
3. At this point of infinite density, one can’t predict the future, whic...

Black holes cannot be seen as they don't reflect any light.

The centre of black hole is called singularity - a point of infinite density i.e the space curvature extends to infinity.

• if you take pressure out of the calculation,a uniform spherically symmetric star would contract to a single point of infinite density,I.e,Singularity.
• A singularity is what you end up with when a giant star is compressed to an unimaginably small point.
• It refers not...

• All the black hole will remember is the total mass, the state of rotation and the electric charge.
• A black hole has a boundary, called the event horizon. This is where gravity is just strong enough to drag light back and prevent it escaping.
• Because nothing can travel faster...

• But scientists know they exist because they rip apart stars that get too close to them and because they can send tremors through space.
• It was a collision between two black holes more than a billion years ago that triggered what are called ‘gravitational waves’.