Physics astronomy blog link
Over the past whole year, there's been a lot of excitement about the electromagnetic propulsion drive, also known as EM Drive - a logically impossible engine that's challenged almost everyone's prospects by continuing to stand up to experimental study. The EM drive is so thrilling because it yields enormous amounts of propulsion that could hypothetically blast us to Mars in only 70 days, without the need for dense and costly rocket fuel. Instead, it's actually propelled forward by microwaves bouncing back and forth inside a sealed off chamber, and this is what makes the EM drive so powerful, and at the same time so debatable.
Jerry Pournelle links to the MIT article.
and this video summarizes it.
The UKMail article is a bit easier for those of us who have a limited background in electrical engineering. It has something to do with microwaves.
Gizmodo article HERE includes a photo
Wired UK article here.
"Test results indicate that the RF resonant cavity thruster design, which is unique as an electric propulsion device, is producing a force that is not attributable to any classical electromagnetic phenomenon and therefore is potentially demonstrating an interaction with the quantum vacuum virtual plasma."
This last line implies that the drive may work by pushing against the ghostly cloud of particles and anti-particles that are constantly popping into being and disappearing again in empty space. But the Nasa team has avoided trying to explain its results in favour of simply reporting what it found: "This paper will not address the physics of the quantum vacuum plasma thruster, but instead will describe the test integration, test operations, and the results obtained from the test campaign."
The drive's inventor, Guido Fetta calls it the "Cannae Drive", which he explains as a reference to the Battle of Cannae in which Hannibal decisively defeated a much stronger Roman army: you're at your best when you are in a tight corner. However, it's hard not to suspect that Star Trek's Engineer Scott -- "I cannae change the laws of physics" -- might also be an influence. (It was formerly known as the Q-Drive.)