SciencefromBig Think6 days agoAsk Ethan: Why couldn't the Universe have expanded forever?A homogeneous Universe filled with energy cannot remain static; it must expand or contract.
SciencefromBig Think1 month agoEven before the Big Bang, space wasn't truly emptyAn expanding Universe cannot be truly empty: expansion inevitably generates radiation and other energetic quanta, preventing absolute nothingness or absolute zero.