Unmanned U.S. Air Force space plane lands after secret, two-year mission
Surprised nobody's mentioned this possibility as it usually comes up re: the X-37B. Terrifying but I think not out of the question given the strategic potential of such a weapon.<p><a href="https://en.wikipedia.org/wiki/Kinetic_bombardment" rel="nofollow">https://en.wikipedia.org/wiki/Kinetic_bombardment</a>