<a href="https://en.wikipedia.org/wiki/Cold_War" id="mw6Q" rel="mw:WikiLink" title="Cold War">Cold War</a>: The <a href="https://en.wikipedia.org/wiki/Soviet_Union" id="mw6g" rel="mw:WikiLink" title="Soviet Union">Soviet Union</a>, the United States, and the United Kingdom sign the <a href="https://en.wikipedia.org/wiki/Outer_Space_Treaty" id="mw6w" rel="mw:WikiLink" title="Outer Space Treaty">Outer Space Treaty</a> in <a href="https://en.wikipedia.org/wiki/Washington,_D.C." id="mw7A" rel="mw:WikiLink" title="Washington, D.C.">Washington, D.C.</a>, banning deployment of <a href="https://en.wikipedia.org/wiki/Nuclear_weapon" id="mw7Q" rel="mw:WikiLink" title="Nuclear weapon">nuclear weapons</a> in space, and limiting the usage of the <a href="https://en.wikipedia.org/wiki/Moon" id="mw7g" rel="mw:WikiLink" title="Moon">Moon</a> and other <a href="https://en.wikipedia.org/wiki/Astronomical_object" id="mw7w" rel="mw:WikiLink" title="Astronomical object">celestial bodies</a> to peaceful purposes.