Tech - Physics

Dual Nature 🤭
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Did you ever hear about "Big Crunch"???
What is it???
The Big Crunch is a hypothetical scenario for the ultimate fate of the universe, in which the expansion of the universe eventually reverses and the universe recollapses, ultimately causing the cosmic scale factor to reach zero, an event potentially followed by a reformation of the universe starting with another Big Bang.
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The objects such as unwary astronauts, can fall through the event horizon into the black hole, but nothing can ever get out of the black hole through the event horizon.
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A wormhole is a speculative structure linking disparate points in spacetime, and is based on a special Solution of Einstein Field Equation.
A wormhole can be visualized as a tunnel with two ends at separate points in spacetime.
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There are some solutions of the equations of general relativity in which it is possible for our astronaut to see a naked singularity: he may be able to avoid hitting the singularity and instead fall through a “wormhole” and come out in another region of the universe.
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The "Strong Cosmic Censorship Hypothesis" asserts that cauchy horizons inside dynamically formed black holes are unstable to remnant matter fields that fall into the black holes.
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There is a hypothesis known as the "Weak Cosmic Censorship Hypothesis" that protects observers who remain outside the black hole from the consequences of the breakdown of predictability that occurs at the singularity, but it does nothing at all for the poor unfortunate astronaut who falls into the hole.
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The singularities produced by gravitational
collapse occur only in places, like black holes, where they are decently hidden from outside view by an event horizon. This is what is known as the weak cosmic censorship hypothesis.
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There is a singularityof infinite density and space-time curvature within a black hole. At this singularity the laws of science and our ability to predict the future would break
down.
However, any observer who remained outside the black holewould not be affected by this failure of predictability, because neitherlight nor any other signal could reach him from the singularity.
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Themovement of the earth in its orbit round the sun produces gravitationalwaves. The effect of the energy loss will be to change the orbit of theearth so that gradually it gets nearer and nearer to the sun, eventuallycollides with it, and settles down to a stationary state.The rate of energyloss in the case of the earth and the sun is very low—about enough to run a small electric heater. This means it will take about a thousandmillion million million million years for the earth to run into the sun, sothere’s no immediate cause for worry!
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