The possibilities are space could go on infinitely far in which case there never would be an end. Or space could be curved, which means you could go out in that direction and ultimately circle back and return to your starting point. So these are sort of two big possibilities. And look, the quick answer is we don't know. But I can tell you this: As long as we keep seeing evidence of the Big Bang, we are still moving into a universe that's our whole. Right. Imagine the day where that horizon washes over the last bit of matter that experienced the Big Bang. All of what we know of cosmology would have no data set at that point. At that point
Neil deGrasse Tyson, comic co-host Chuck Nice, and theoretical physicist and author Brian Greene answer questions from our fans about string theory, the fabric of spacetime, interstellar travel, free will, and the meaning of life.
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Image Credit: ESO/IDA/Danish 1.5 m/R.Gendler and J.-E. Ovaldsen.
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