But this is a GIANT railgun. Not designed for warfare, but designed specifically for space travel. It is around 35 metres diametre, and about a mile long. Like a mass driver? Also see The Moon is a Harsh Mistress, by Robert Heinlein. Yeah, essentially a mass driver. It has its own nuclear reactor powering it, so that isn't an issue. Ross, PM's man! Hey, if he wants to freely advertise the locations of highly valuable technologies like that, that's his business. I'm sure that installation is very heavily guarded.