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advance AFTERWORD animals antimatter antiparticles antiuniverse asteroids astronomer atmosphere atoms beginning black hole body Callisto Cassiopeia century chimpanzee coal comet computers cosmic egg course Cyrano detected distance Earth effect electric charge electrons energy engine enormous essay exist exploration extraterrestrial fact FOREWORD fuel galaxies Ganymede giant gravitational pull Greek heat human hydrogen imagine indefinitely Io's Jupiter kilometers land large satellites larger less light light-years live Lunar colonists mankind Mars Martian mass matter Mercury methane miles million molecules Moon Moon's move negative neutron stars ocean once orbit outer percent perhaps petroleum planet population possible produce quantity radiation radio reach remain revolution science fiction ship smaller Solar system space colonies space station speed starship steam Sunlight supply sure surface tachyonic temperature tion trillion true satellites universe vacuum Venus volatiles white dwarf zero