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

For more than a century, gravity has been the immovable backdrop of modern physics, a force that can be described and ...

An engineer who once worked with NASA says he has built a machine that can push against gravity without burning a drop of ...

GOCE’s sophisticated electric ion propulsion system has been switched on and confirmed to be operating normally, marking another crucial milestone in the satellite’s post-launch commissioning phase.