[SPOILER] In Interstellar, what happens to humanity in the end?

Humanity is saved because both Plan A and Plan B worked.  Cooper and TARS found the solution to the gravity equation in the black hole, and Cooper programmed the solution into the second hand of the watch.  There was already a plan to evacuate mankind into the rotating space colonies, but it couldn't be pulled off without the gravity equation.  Once Murph Cooper got the data from the watch, she could solve the gravity problem and begin work to set in motion the space colonies to evacuate earth.  Meanwhile, Dr. Brand, certain that all was lost, and having lost many years by orbiting so close to the black hole, went to Edmund's planet to settle and begin Plan B.  At the end of the film, we see her starting a new colony with the new people from Plan B.  She is unaware that the gravity equation worked and that people from Earth have been evacuated.  The movie ends with Cooper going out to find her, which will be the first step in bringing all of surviving humanity to Edmund's planet.

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Kris Johnson on Quora:

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