PhysicsHow Einstein was both right and wrong about gravitational waves A century ago, Albert Einstein suggested that the universe might contain ripples in space-time, known as gravitational waves – but then he changed his mind ¿ìè¶ÌÊÓÆµ
SpaceTwo NASA astronauts may be stuck on the space station until February Boeing’s Starliner spacecraft had so many problems during its first crewed launch to the International Space Station that NASA officials aren’t sure whether it will be able to bring its crew back home as planned ¿ìè¶ÌÊÓÆµ