Remember the philosophical argument our universe is a simulation? Well, a team of astrophysicists say they’ve created the biggest simulated universe yet. But you won’t find any virtual beings in it—or ...

READER QUESTION: My understanding is that nothing comes from nothing. For something to exist, there must be material or a component available, and for them to be available, there must be something ...

Scientists have spotted an unusual gravitational-wave signal that may reveal the universe’s first primordial black holes—tiny relics dating back to the Big Bang. Recorded by LIGO–Virgo–KAGRA in ...