PhysicsStar smash-up is yet more evidence Einstein got it right about gravity General relativity has survived its latest test after observations of a violent collision between neutron stars tallied perfectly with Einstein’s theory News
PhysicsThe most precise atomic clock ever made is a cube of quantum gas The best atomic clock will only be out of sync 3.5 times in every 10 quintillion ticks. It could help test general relativity and hunt for gravitational waves News