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Interstellar: Who are “They”? | Passion for Astronomy

Interstellar is an incredibly ambitious film. It’s also quite complicated, not only because of the scientific aspects involved.

Interstellar is one of the science fiction films that causes the most discussion, even 12 years after its release. You may have wondered who the elusive “Them” are that Cooper refers to in the membership card scene. Assuming the protagonist is right, “they” are our descendants, who evolved to exist in five dimensions (currently there are four, height, width, depth and time). Because they exist in five dimensions, their experience of time is not linear like ours. They are the ones who create the wormhole and the tesseract that then saves Cooper and allows him to communicate the quantum data to his daughter to save humanity.

What is a membership card?

In the Marvel universe the Tesseract it is an Infinity Stone, an object of extraordinary power. In our universe, however, tesseract is the geometric term for a four-dimensional cube. If a cube is the three-dimensional equivalent of a square, a tesseract is the four-dimensional equivalent of the cube (again, the fourth dimension is time.) You can read more about that here, but the important thing is that the tesseract is a space constructed by “them” for Cooper to communicate with Murph.

If “they” are descended from humans and Cooper saves humanity, then how could “they” exist in the future if Cooper hasn’t saved humanity yet?

The ending of Interstellar would seem to present a “paradox of predestination”. This is a type of time paradox in which a chicken sends an egg back in time, which then becomes that chicken. A popular example is Terminator: in the first film of the series, Kyle Reese is sent back in time by John Connor to protect Sarah Connor, John Connor’s mother. The paradox is that Reese turns out to be John Connor’s father: by sending Reese back in time, John Connor created himself. Without time travel, the possibility of such a thing remains theoretical, but it’s something theoretical physicists have been arguing about for some time.

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