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Hi! I just want to make sure: If an object were to somehow have a velocity that is greater than the speed of light (which is impossible as far as we know) would it indeed go back in time? And in some cases be able to interact with its past self, as Anthony (physics) said? Thanks for your help!
Answer 1:

If an object were able to go faster than the speed of light, it would indeed go back in time. Given the correct conditions it could possibly interact with its past self. This is one of the reasons why scientists don't believe anything can go back in time. If a future you came and interacted with you (perhaps harming you in some way!), very strange things could happen. How could a time traveler who could potential kill or otherwise incapacitate his past self then still exists in the future to travel back in time in the first place!



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