
The concept would be rather simple too, you only need so much power to get to space, once the projectile (most likely a metal tank the size of a house full of compressed waste) leaves the earth's gravity pull, whatever power it has left will simply keep it moving away from earth, and if properly planed and calculated they could launch it at the sun, or at least away from the galaxy.
Cost would be an issue, but I'm sure it would be cheaper then what they spend to send rockets in space, since all they would need to send is the tank, but the main device (the rail gun) would stay on earth.
Just a wacked idea I came up with that could start discussion.

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