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The Challenge of the Planetoids
The Legacy of an Italian Goddess
NeededA LongRange Manned Space Flight
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albedo aphelion Asteroids astronauts astronomical units atmosphere bomb booster captured planetoid celestial close CN CN CN CN CN OO CN h CN OO CN OO OO colonies comets cost Deimos discovery Earth orbit Ecliptic coordinates energy Eros exploration extraterrestrial feet per second flight fly-by Geographos gravity h CN CN h oo interplanetary islands Jupiter landing linear motor low Earth orbit lunar major Mars Martian Mercury meteorites miles in diameter million miles minor planets moon nuclear objects OO CN CN OO h oo oo oo payload perhaps perihelion Phobos possible probably probes problem propellants propulsion Q CN radiation rocket satellites Saturn scientific scientists Sky and Telescope solar system space spaceflight spaceship stars surface target theory thousand feet thousand pounds tion Tombaugh trip vehicle velocity change Willy Ley