The Fram2 crew will be the first people to observe the polar regions from low Earth orbit, and they'll work on experiments ...

The billionaire is in position to speed up plans for a voyage to the planet, with a potentially huge impact on SpaceX.

This new propulsion system could rewrite the rules of spaceflight—not to mention completely defy conventional physics.

Editor in chief Nancy Shute traces the history of nuclear weapons, from the first sustained nuclear reaction in 1942 to the renewed interest in explosive tests today.