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Aerobee rocket Aerojet Aerojet-General air resistance altitude artificial satellites atoms back to Earth body Brick Moon Cape Canaveral carry cent Chapter cosmic rays density distance Earth Satellite Earth's surface effect energy engineers Equator establish exactly exist extremely fact Figure firing Fred Singer fuel give gravitational field gravity ground stations guidance hundred miles important instruments interplanetary ionosphere launching liquid-propellant Martin Company meteor miles an hour Minitrack minutes missile moving natural satellites observations operate oxygen payload period planet Plate Polar possible problem produce Project Vanguard propellant propulsion radiation radio reached relay rocket motor satel satellite orbit satellite program satellite vehicle satellite's satelloid scientific scientists second stage solar solid-propellant space station speed spin stars synodic period telescope thousand miles tion tracking transmitter UDMH upper atmosphere Vanguard satellite Vanguard vehicle velocity Viking rocket visible waves weight Wernher von Braun