"It would be amazing if a simple rotation of the universe was the origin of dark energy." What is dark energy? Why does dark energy seem to be weakening? Is our universe part of a larger multiverse?

Could the Universe have been born inside a black hole? This question, raised by a team of scientists, challenges the Big Bang theory. Their proposal suggests our Universe might have formed within the ...

Could our universe be expanding then shrinking back into a tiny point, reliving a kind of big bang over and over again? Probably not, according to a mathematical analysis that argues that the laws of ...