I'll just link you to https://en.wikipedia.org/wiki/Novikov_self-consistency_principle https://en.wikipedia.org/wiki/Novikov_self-consistency_princ... It's by

I'll just link you to https://en.wikipedia.org/wiki/Novikov_self-consistency_principle https://en.wikipedia.org/wiki/Novikov_self-consistency_princ... It's by far my favorite way to explain time travel system like the one we see in Interstellar, and it's rooted in real science rather than Paradox Philosophy.