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George
- 6
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Can anyone say how big a black hole is? Could its diameter be less than the distance that light can travel - ie less than one wavelength?
A black hole is a region in space where the gravitational pull is so strong that nothing, including light, can escape its grasp. It is formed when a massive star dies and its core collapses in on itself.
The size of a black hole varies depending on its mass. The basic rule is that the more mass a black hole has, the larger it will be. The largest black hole discovered so far is about 40 billion times the mass of our sun.
The size of a black hole is measured by its event horizon, which is the point of no return where the gravitational pull becomes so strong that even light cannot escape. The event horizon is directly proportional to the mass of the black hole.
According to current theories, a black hole can only grow in size as it continues to absorb matter and increase its mass. However, there are some theories that suggest black holes can evaporate over extremely long periods of time due to Hawking radiation.
No, it is not possible for a black hole to have a size of zero. All black holes have a finite size, even if it is extremely small. This is because the event horizon is directly proportional to the mass of the black hole, and even a small mass will have a corresponding event horizon.