Electromagnetic propulsion by NASA

NASA scientists have reported that they've successfully tested an engine called the electromagnetic propulsion drive, or the EM Drive, in a vacuum that replicates space. The EM Drive experimental system could take humans to Mars in just 70 days without the need for rocket fuel, and it's no exaggeration to say that this could change everything.

But before we get too excited (who are we kidding, we're already freaking out), it's important to note that these results haven't been replicated or verified by peer review, so there's a chance there's been some kind of error. But so far, despite a thorough attempt to poke holes in the results, the engine seems to hold up.

The engine is controversial because it seems to violate one of the fundamental concepts of physics - the conservation of momentum, which states that for something to be propelled forward, it needs some kind of propellant to be pushed out in the opposite direction. But the EM Drive doesn't require any propellant in order to create thrust, it simply relies on electromagnetic waves.

However, British scientist Roger Shawyer, who invented the EM Drive in the early 2000s, disagrees that his design violates the conservation of motion. "To put it simply, electricity converts into microwaves within the cavity that push against the inside of the device, causing the thruster to accelerate in the opposite direction," writes Mary-Ann Russon over at The International Business Times, who interviewedShawyer after the story on NASASpaceflight went viral.

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