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absolute zero albedo Alpha Centauri American Antarctic Antarctica Asimov asteroid belt astronomer atoms average Barnard's star base billion black hole captured carbon carbonaceous chondrites cent civilizations close craters decimal Deimos density discovered distance Doubleday collection Earth Earthlike planets effect equation essay evaporation existence exploration exponents extraterrestrial fact farther fresh water galactic Galaxy gases gravitational Greenland helium helium-3 hominids human hydrogen ice sheet icebergs intelligent island Joule-Thomson effect Jupiter kilograms kilometers land larger latitude less light light-years liquefied liquid log table logarithms longest diameter Mars Martian satellites mass massive matter meteorites miles mini-black hole molecules Moon move multiplied ocean orbit oxygen penguin perfect gas Phobos Phobos and Deimos planetary system pressure proper motion Proxima reached Road to Infinity Roche limit Saturn ships slide rule smaller solar system South Pole southernmost species speed subtraction suppose surface temperature tion Trojan Uranus voyage