Question: Is Time Travel possible?

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  1. It seems unlikely to me, but as yet no one has discovered any reason why it violates the laws of physics (although it seems to me that it should somehow). I actually went to a talk last week by someone who is thinking about this problem for a single particle of light – they are trying to think of experiments that could be done that would demonstrate that it is or isn’t possible.

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  2. I also think that it’s unlikely, although I think that Einstein’s theory of relativity suggests that it might be possible. There are all sorts of problems with causality though: for example, someone could travel back in time and kill one of your grandparents, which would mean you no longer exist. So, I think that this type of thing means that it’s probably not possible.

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  3. May not be possible, but the idea itself is incredibly exciting! And fabulous to think that someone is looking into it!

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  4. If you could do it – would you change anything?

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