The Space Cannon that was Actually Fired in Orbit. In 1974 the Soviet Union secretly orbited a fully armed and operational battle station.

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[–]zyxzevn 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

A cannon is pretty worthless.
But I think the real weapons of all nations are still top secret.