SpaceFar-off galaxies are firing rare high-energy cosmic rays at us The highest energy particles in the universe hit Earth very rarely, so it took 10 years of data to pinpoint their origin. They’re coming from galaxies far, far away 51¶¯Âþ
PhysicsUltrafast lasers catch electrons relaxing after brief excitement Pulses of light that last billionths of a billionth of a second have helped unravel a mystery inside solid objects and could help us build better X-ray lasers 51¶¯Âþ