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[[1921]] – [[Albert Einstein]] suggested the possibility of measuring the universe with his address "Geometry and Expansion," at the Prussian Academy of Sciences in Berlin. <br> [[1967]] – More than sixty nations sign the Outer Space Treaty banning nuclear weapons in [[space]]. <br><br><br><center>'''Fun Fact:''' <br />[[1967Luna|The moon]] is getting farther away from the [[Earth]] - During a routine test on the launch pad, a spark caused a fire to start in the crew compartment of the command module. Gus Grissom, Ed White, and Roger Chaffee, were killed in this tragic incidentabout 1. It was later determined that faulty wiring caused the spark, and the pure oxygen environment in the capsule was to blame for the rapid spreading of the blaze48 inches per year.</center> <noinclude>[[Category:On This Day|027]]</noinclude>