After reading Marosz's thoughts I think he is on an interesting track. Three problems with his theory: 1. Gravity waves are not EM waves. They are variations of spacetime density, in my opinion. Therefore, gravity waves cannot be detected because the detector is normally placed where the wave is thought to be occurring. The detector changes density with the wave. The only way to detect, use or whatever purpose a gravity wave is to have a detector outside of the wave and an EM source on the other side or inside the wave. This is seen with the flyby anomaly here http://en.wikipedia.org/wiki/Flyby_anomaly. This is also why the anomaly doesn't always appear. Sometimes, there is a gravity wave between the spacecraft and Earth and sometimes there isn't. 2. NASA has determined that mirrors (in this case, groves) are not required. 3. In Marosz's theory, the apparent acceleration would be along the path taken by the solar system and Earth through the galaxy. This was not the case in the paper submitted by NASA to arXiv. The same effect explains the Pioneer anomaly - both change in velocity and change in the spin-rate. No other explanations, to date I've found, explains both. That far out spacetime is simply less dense because there is less mass in that area. Besides, I don't see the acceleration being due to thrust. It should be due to pull toward the lower spacetime density created on one side of the engine. All my opinion, nothing more.
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