PhysicsA miniature universe shows particles may emerge out of empty space A first-of-its-kind experiment simulating the cosmos with ultracold potassium atoms suggests that in a curved, expanding universe pairs of particles pop up out of empty space News
PhysicsEinstein's gravity principle still correct, finds most precise test An experiment conducted on a satellite in orbit found that Albert Einstein's ideas about gravity are still correct, with measurements accurate to one part in a quadrillion News