Reply #8: Placing weapons in space is illegal.

[baldguy]

http://www.state.gov/t/ac/trt/5181.htm

Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, Including the Moon and Other Celestial Bodies

Bureau of Arms Control

Signed at Washington, London, Moscow, January 27, 1967
Entered into force October 10, 1967

Narrative

The Outer Space Treaty, as it is known, was the second of the so-called "nonarmament" treaties; its concepts and some of its provisions were modeled on its predecessor, the Antarctic Treaty. Like that Treaty it sought to prevent "a new form of colonial competition" and the possible damage that self-seeking exploitation might cause.

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Signed by United States 01/27/67
Ratified 10/10/67