PhysicsCould we ever go back in time? Relativity does not rule it out The physics thought to explain the arrow of time is not as simple as you might think – and in traversable wormholes, Einstein’s theory of general relativity does in principle offer routes to the past Features
SpaceBetelgeuse star dimming puzzle solved by chance with weather satellite The sudden dimming of Betelgeuse in 2019 has been puzzling astronomers ever since, but now we have nailed down the cause ¿ìè¶ÌÊÓÆµ