From what I understand, while it doesn’t break any of the laws of physics it bends them quite a bit and would require a huge leap forward in our understanding of the universe.
Basicly when we are sending space crafts to other systems and have things like effective anti-matter engines and have worked out the kinks in fussion power... then we might make some break throughs.
"About not being able to go further in the past then when the time machine was built" yeah I’ve heard that as well. however there are several different theories on the matter...read all about them in Physics of the Impossible.
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