Reference Artemis 1 is the first stage of the Artemis program designed to return astronauts to the moon. The uncrewed mission will travel to the moon and back.
Stars appear to twinkle because the light from these distant objects passes through wobbly air in the atmosphere.
Was Einstein wrong? His theory of space-time may have to be killed off if we want to better understand the universe.
Usually confined to the pages of science fiction, astronomers are starting to think wormholes through space-time might be real after all.
Space mysteries: How gravitational waves could explain how our universe began when another one ended.