It’s one of the most intriguing stories of the year: NASA’s version of the 'impossible' EM Drive appears to produce thrust, violating Newton’s third law and hence our current understanding of the physics that govern the Universe.

But just because NASA’s space drive test passed peer-review last month, doesn’t mean it actually works, says Brice Cassenti, an expert in advanced propulsion systems at the University of Connecticut. In fact, due to the array of errors that could have affected the experiment, he says the only way we can actually know the truth is to test the EM Drive in space.

"[M]any scientists and engineers feel the thrust measurements reported for the EM Drive are due to experimental error," Cassenti said in a recent interview.

"Adding to this is the fact that those who believe the results are valid do not yet have an experimentally or a theoretically plausible proven physical explanation. I personally believe that there is a mundane explanation for the results."

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