For nearly 20 years, scientists have debated the viability of an EmDrive, a hypothetical type of engine that could propel a spacecraft without the need for any fuel. Now, a team of German physicists ...

More experiments on the much-overhyped EMDrive continue to prove absolutely nothing except that it’s easy to create ambiguous results if you’re sufficiently sloppy with your experimental design.

Given fuel usually makes up the majority of the mass of any spacecraft trying to break the bonds of gravity, developing propellantless propulsion systems might be the key we need to really open up ...