The notion of gun-propelled launch goes back to Jules Verne. Such Mass Drivers have been envisioned in numerous Sci Fi tales, including Earthlight, by Arthur C. Clarke, Robert A. Heinlein's The Moon is a Harsh Mistress, and Heart of the Comet by Benford & Brin. We've also seen them portrayed in Buck Rogers, Babylon 5 and Halo. Now, two researchers propose that a space-capable mass driver may be feasible. Startram would act as an electromagnetic catapult, using maglev technology, to accelerate and launch spacecraft into orbit, without using rockets or propellant. James Powell and George Maise take a highly optimistic view, claiming that a system capable of launching payload into orbit for less than $40/kg could be built using existing technology—if we were to gather substantial international support.