Wow. That sounds like a fun way to kill a mystic adept... wonder why thats not a weapon in real life.
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The things people DO NOT know, frighten me almost as much as what they know.
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Honestly? Only the UN treaty ban on space born weapons.
Reagan proposed this with the Star Wars Program back in the 80s during the Cold War with Russia.... but THIS idea got buried in the media under stories of "KILLER LAZORS IN SPACE TO FRY YOUR BRAIN!!!" and other drivel....
The technology is simple. It's getting it into space and set up that cost money. The figure I heard (but can't confirm -hopefully someone with better google-fu can) is that for each kilogram of material you launch into space, it costs $10,000. (fuel, labour, vessel, etc). So, while a 200kg steel rod is cheap on earth. getting that into space (and JUST into space) is $2,000,000! And now you have to get all the other crap up there too (like the computer, the launcher, the holder, etc)
If you believe the Conspiracy Crowds, there already ARE Thors, Nukes, Bio warheads, and Chemical weapons in space.... All waiting for their Evil overlords to push the button. (Who that is, depends on the Nut talking)....