13.7 billion years agoThis is the widely accepted date of birth for the universe.Jump ahead1917 Albert Einstein proposes the existence of a bizarre energy that counteracts gravity and pushes matter apart. Einstein referred to this energy as the cosmological constant. He later retracted this idea, calling it his "biggest blunder."1929Edwin Hubble, using the 100-inch Hooker telescope on Mount Wilson, compares distances of nearby galaxies to their redshifts and discovers that galaxies are moving aw...