A group at NASA’s Johnson Space Center has successfully tested an electromagnetic (EM) propulsion drive in a vacuum – a major breakthrough for a multi-year international effort comprising several competing research teams. Thrust measurements of the EM Drive defy classical physics’ expectations that such a closed (microwave) cavity should be unusable for space propulsion because of the law of conservation of momentum.

there’s a low, but nonzero probability that we’ll have a reactionless drive by eoy:

Spacecraft equipped with a reactionless drive could potentially make it to the moon in just a few hours, Mars in 2-3 months, and Pluto within 2 years. that’s about 4x faster.

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