What is the universe expanding into?
MAR 21, 2007
DOI: 10.1063/PT.5.020956
Universe Today (audio): Come on, admit it, you’ve had this question. If the Universe is expanding from the Big Bang, what is it expanding into? What’s outside the Universe? Ask any astronomer and you’ll get an unsatisfying answer. We give you the same unsatisfying answer, but really explain it, so your unsatisfaction doesn’t haunt you any more.
© 2007 American Institute of Physics
