Elon Musk’s SpaceX dominates the news these days, but a host of oddballs involved in space exploration came before him.

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

Engineers are exploring propulsion methods that could enable longer-distance travel ...

Researchers have developed scalable lightsails, ultra-thin, reflective structures that use laser-driven radiation pressure to ...