Season 148 - Day 7 of 14

Physics

In the science fiction film Back to the Future (1985) the main character, Marty McFly, travels back in time and meets his own mother as a young woman.
His mother, not knowing who Marty really is, begins to fall in love with him instead of falling in love with Marty’s father. The problem is that if Marty’s mother and father do not end up together, then Marty will not be born in “the future”.
In (theoretical) physics, this this is a well-known paradox. What is the name of this paradox?

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