time travel - What happens to the second Marty at the end of Back to the Future?

In Back to the Future (the original movie), Marty comes back from 1955 10 mins early to prevent Doc from being shot (which he fails at). He then rolls up to the Lone Pine Mall and sees himself hit 88 mph and shoot back to 1955 (again). Marty then carries on with this life as usual. What happens to the Marty that goes back to 1955 at the end of the film?

This obviously is a recursive problem where it would create another timeline and Marty would keep coming back 10 mins early to view another Marty zip back to 1955?

Answer

Picture a string - Marty's movement through space and time. Twist a loop in the middle. For a time, the string parallels itself - that's the time there appeared to be two Marty's at the mall parking lot. Then Marty in the time machine travels back, and Marty on foot continues with life.

Same Marty. Just different points along his personal timeline.

Comments

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