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Chronos
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An observer inside an event horizon would suffer from reverse redshift. He/she would 'see' the universe age at infinite speed according to GR. Draw the light cone.
Dmitry67 said:in GR all coordinate systems are equally vaid. So in some coordinate systems BH forms in finite time. In the others we lose communication with the inner parts of BH.
A black hole is a region in space where the gravitational pull is so strong that nothing, including light, can escape from it. It is formed when a massive star dies and its core collapses under its own gravity.
While we cannot see black holes directly, we can observe their effects on the surrounding matter and light. For example, we can detect the gravitational lensing effect where the gravity of a black hole bends light from objects behind it.
No, anything that enters a black hole will be crushed and stretched due to the intense gravitational forces. However, some theories suggest that objects may be able to survive the outer edge of a black hole, known as the event horizon, but they would still be unable to escape.
Yes, black holes can grow in size by absorbing matter and merging with other black holes. However, they can also lose mass through a process called Hawking radiation.
There is currently no evidence to suggest that black holes can be used for time travel. While they do have strong gravitational forces, the laws of physics as we know them do not allow for time travel through black holes.