The Exploration of Mars

2-hour orbit 42 Wing altitude aphelion Asaph Hall astronomers Bonestell canals capture orbit cargo ship Cassini centre Christiaan Huyghens circum-Martian orbit clouds colour crew Cut-off dark areas degrees Deimos diameter distance drawings of Mars earth earth's atmosphere ellipse fuel Gérard de Vaucouleurs glider ground hull Huyghens hyperbola incl Initial weight interplanetary Kepler km/sec Lacus landing craft Lick Observatory Lowell manoeuvre Map of Mars Maraldi Mare Mars ships Mars-bound Martian atmosphere Martian orbit mi/sec miles per second million miles moon northern hemisphere observations Observatory orbit of Mars orbital supply orbital velocity oxygen passenger ship payload Percival Lowell perihelion Phobos planet Mars polar cap pole power manœuvre propellant tanks radio rocket engines rocket ships rotation round the sun satellite Schiaparelli ship's Sinus Space Lift space station speed stars supply flights surface Syrtis Major telescope temperature thrust tons Total propellants U.S. METRIC Weight of relief wings