I have a theory. When the sun exploded it may, like other stars, turn into a black hole. If the Earth is sucked into the black hole and we go back in time we could live again®. Is this at all plausible if black holes really can control time.
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ANSWERS: 7
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The key to any answer to your question is IF. If black holes can control time, then your hypothesis is possible. It cannot become a theory until there is some evidence backing it however.
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The thing about Black Holes, is that they bend space time. (In essence, anything with gravity warps space/time). Black Holes have such an intense gravitational field, that even light cannot escape from it. It is impossible to survive such intense forces. The time travel idea is science fiction branched out of this "bending space time" theory. However, a new theory, String theory, suggests that wormholes to different dimensions could exist. In the way you described it, it seems physically impossible to me.
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When did the sun explode?
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If you went into a black hole you would die very quickly, as has been said they are massive concentration of mass which distort space/time, but by the time you got anywhere near (apart from the massive gravitational force ripping you apart) you feet would be passing through time at a different pace to your head.
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No, this is not possible because your theory is based on an entirely erroneous assumption. The Sun will not explode and turn into a black hole. It does not have enough mass for this. The Sun will die relatively quietly and turn into a white dwarf. The Earth itself will be destroyed when the Sun becomes a red giant as it begins to run out of nuclear fuel on its way to becoming a white dwarf.
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I am fairly certain that if the sun exploded, whether or not it turned into a black hole in the end, we'd all be killed pretty quick. But, assuming that somehow we did survive long enough to be sucked into a black hole, there is still nothing that says that a black hole can actually control time. But lets say it can. If it can, we will be broken down into atoms and sent back in time. We will float around space as atoms forever. Yay!
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The sun is not big enough to both A. Turn into a black hole and B. Create a explosion. The sun will just peacefully die out and turn into a dwarf start, collapsing in upon itself and turning all the suns mass into a very dense small star the size of New York city.
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