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Yes, but they only work on low gravity bodies such as asteroids, as the thrust produced is quite low. They don't work in an atmosphere because the atmosphere would cause an arc between the ion generator and the ion accelerating grid, shorting them and removing the accelerating field, or melting the ion drive. Or, if the electric field between the ...


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The question has already been answered pretty well, but I think more explanation of why big antennas help would be worthwhile ... Antennas have a property called "gain" which means that they work best in one direction (or several directions, depending on the type of antenna) and less well in others -- so a transmitting antenna with high gain sends its ...


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The space elevator probably deserves an entire series of questions (and I am sure there have been plenty of posts), but if we stick to this particular version, there are a couple of problems with it. First of all, a space elevator needs a counterweight in an orbit that is higher than the areostationary orbit (the Martian equivalent of Earth's geostationary ...



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