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Roger Penrose said:
thank you.
what he meant by that ?
thank you.
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what he meant by that ?we are considering a closed universe so eventually it should recollapse, and to estimate the entropy of the final cruch by using the Bekenstein-Hawking Formula as though the whole universe had formed, would give an entropy per baryon of 10 to the 43rd power, and the ‘absolutely stupendous total’ for the enture big crunch being 10 to the 123rd power.
thank you Bill_K for the clarification.Bill_K said:He said, "as though." He's just using a black hole as an analogy to make a very crude estimate for the total entropy.
A black hole is a region in space where the gravitational pull is so strong that nothing, including light, can escape from it. This happens when a massive star dies and collapses, creating a singularity with infinite density and zero volume.
There is currently no evidence to suggest that we live in a black hole. In fact, our understanding of black holes is based on observations of distant objects, not our own environment. The laws of physics that govern our everyday lives do not indicate that we are living in a black hole.
No, we cannot see black holes directly because they do not emit any light. However, we can observe the effects of a black hole on its surroundings, such as the distortion of light from objects near the black hole's event horizon.
According to our current understanding of physics, it is impossible to escape from a black hole once you have crossed its event horizon. However, some theories suggest that it may be possible to travel through a black hole and emerge in another region of space or time.
There is a theory known as the black hole universe hypothesis that suggests our universe could be inside a black hole. However, this is purely speculative and not supported by any evidence. The prevailing scientific consensus is that our universe originated from the Big Bang and is expanding, rather than being contained within a black hole.