According to NASA, the controversial EM Drive does appears to work. Reportedly, despite installing "a 2nd generation magnetic damper which helps reduce stray magnetic fields in a vacuum chamber," the drive still produced thrust, leaving scientists puzzled as to how that's even possible.
While these advancements and additions are no doubt a boon for continued research of the EM Drive, the fact that the machine still produced what March calls “anomalous thrust signals” is by far the test’s single biggest discovery. The reason why this thrust exists still confounds even the brightest rocket scientists in the world, but the recurring phenomenon of direction-based momentum does make the EM Drive appear less a combination of errors and more like a legitimate answer to interstellar travel. [...]
In other words, as explained by io9, NASA's latest experiment rules out environmental conditions and confirms that the drive could perform well in a vacuum:
The NASASpaceflight.com group has given consideration to whether the experimental measurements of thrust force were the result of an artifact. Despite considerable effort within the NASASpaceflight.com forum to dismiss the reported thrust as an artifact, the EM Drive results have yet to be falsified.
After consistent reports of thrust measurements from EM Drive experiments in the US, UK, and China – at thrust levels several thousand times in excess of a photon rocket, and now under hard vacuum conditions – the question of where the thrust is coming from deserves serious inquiry.
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