Is there any theory that allows traveling back thorough time based on what we know? I thought any reasonable theory around time travel conforms to general relativity, in that you would only be able to slow time for yourself, thus appearing to have traveled through time. Logically, I don't know how you can come up with a theory to travel backwards. Practically, once that ability exists, I don't know how we would be blind to it. So I'm actually more on the "aliens" side.
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