The source of energy, matter and the universe itself. is the ultimate mystery of, well, the universe.
Based on a widespread afterglow called the cosmic microwave background (and other evidence), scientists think that the cosmos formed from a “Big Bang” — an incomprehensible expansion of energy from an ultra-hot, ultra-dense state.
Describing time before the event, however, may be impossible.
Still, atom smasher searches for particles that formed shortly after the Big Bang could shed new light on the universe’s mysterious existence — and make it a bit less strange than it is today.