B How could something that is infinite (the Universe) expand?

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The discussion explores the concept of the universe's expansion in relation to its infinite nature, questioning how something infinite can grow larger. It emphasizes that "expansion" refers to the change in scale of space rather than a physical growth into another space. Participants illustrate this with examples, such as stakes in the ground moving apart, which can demonstrate local expansion regardless of the universe's infinite nature. The conversation also touches on the mathematical implications of infinity, noting that while distances can increase, the concept of an "infinitieth" point is nonsensical. Ultimately, the expansion of the universe does not require it to be finite or to expand into something else.
  • #31
valenumr said:
Even if they expand by an extremely small rate, the "intfintieth" stake would be moving away, well, at infinite speed. Would it not?
If a thing does not exist then it is meaningless to speculate on its properties. It cannot even be correctly referred to. The "infinitieth stake" falls into this category. It cannot properly be referred to.
 

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