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I want to know the answer too. I always thought the universe is expanding to a larger universe. I never thought that it could be expanding to something else.

• fvdessen 8y ago
  the universe doesn’t expand into something bigger. It’s like multiplying the set of the real numbers by two, the set doesn’t become bigger and its boundaries do not change.
  • foo101 8y ago
    I think you or someone understands this subject should write a detailed comment in this thread that explains this to software folks like us. I appreciate the help.
• Moodles 8y ago
  I think it’s like the universe being a balloon (infinite or not) and inflating it. The space between any two points on the balloon increases over time. And at the Big Bang the space was basically 0.
• olavk 8y ago
  Think of it another way: All matter in the universe is getting smaller. But the universe have the same size, so distances between everything increase.
• mockingbirdy 8y ago
  There's no notion of spacetime outside the universe. The spacetime is the universe. Two assumptions: a) the universe is infinite. In this case it doesn't expand into anything, the things inside of it just stretch apart. b) the universe is finite. In this case it expands into something, but because we're trapped inside spacetime, we can't answer this scientifically. The wording "expanding" adds more confusion than it helps. See [1] for the discussion about this topic. [1]: http://curious.astro.cornell.edu/ask-a-question/104-the-universe/cosmology-and-the-big-bang/expansion-of-the-universe/623-what-is-the-universe-expanding-into-intermediate http://curious.astro.cornell.edu/ask-a-question/104-the-univ...