The Space Guidebook

Air Force altitude America's appear areas asteroids astronauts astronomers Atlas atmos atoms Baade believe bright canals capsule century clouds clusters comets constellation cosmic craters crews dark degrees diameter discovered distance dust and gas earth earth's atmosphere eclipse engine Explorer extremely feet fired flying Fred Hoyle galaxies gases giant Hale telescope heat hundred hydrogen ICBMs Jupiter launched layer light light-years lunar Mars Martian meteorites meteors miles a second million miles minutes missile moon moon's surface night nuclear Observatory oceans optical orbit outer space oxygen particles pilot planetary polar Polaris missiles probe pull of gravity radar radiation radio signals radio telescopes rays re-entry rocket rotation Russia satellite Saturn scientists Scott Carpenter shape solar system Soviet space ship speed spot stars station sun's sunspots target temperature theory tion United universe Uranus vapor vehicle Venus Walter Baade weather weight weightlessness