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2WHAT WE KNOW ABOUT THE EARTH
4MAN INTO SPACE
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300-mile orbit aeronautical engineering Air Force Base airplane altitude ARPA astronauts astronomers Atlas aviation back to Earth Ballistic Missiles Bell X-2 bomber booster burnout capsule Captain celestial communications satellite Crossfield defense degrees devices Earth's atmosphere Edwards Air Force Ehricke ejection energy equipment escape velocity Explorer feet fighter Flight Test fly the X-15 fuel glider graduated inflatable sphere ionosphere ionosphere scatter jettisoned Jupiter Kincheloe knowledge layer liquid oxygen meteorites miles per hour military Moon NASA Navy nitrogen nuclear operation orbit orbital path particles payload Pioneer placed in orbit planets pounds pressure probes Project Mercury propellant propulsion Ptolemy radio reconnaissance scientists Scott Crossfield second stage Sky Bolt solar system sounding rocket space flight space program Space Task Group space vehicles speed strategic temperatures test pilot Thermosphere third stage Thor Thor-Able United upper stage USAF Vanguard Venus Wallops Island X-15 pilots X-15 program