Rockets might be fiery fun, but they're big, bulky, and heavy. Ion thrusters, sci-fi as they sound, are real and these penny-sized ones are probably the future of steering small satellites in orbit. More »
I don't understand why people would think that you would need to use thrusters in empty space when since there isn't any friction if there is any in space? So wouldn't they just be propelled by their own kinetic energy? The only reason I would use thrusters is to stop, turn, or pull it out of...