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

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

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

For decades, scientists have dismissed the idea of reactionless propulsion—the concept of generating thrust without expelling propellant—as a fantasy that defies the laws of physics. But Charles ...

When economist Roger Babson was a boy, his oldest sister drowned. His grandson would later die in a similar manner. As an adult, Babson would use the considerable wealth he made predicting the 1929 ...

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.