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actually Astounding Science Fiction astronauts astronomers atmosphere atoms become body brain burned carbon dioxide century chemical chemists circadian rhythm clock combustion Copyright course dephlogisticated distance duckbill Earth eclipse elements Elijah Baley energy exist faster fire fixed air fourth revolution Greek happen heat Heinlein human hydrogen increase instance Lavoisier less light living lunar mammals mankind Mars mass means measure metal metric system miles per second molecules Moon Moon's motion moving Multivac never nuclear once orbit oxygen perhaps phlogisticated air phlogiston phlogiston theory piece of matter planet platypus population possible problems quantity reach the Moon robot rocket satellite science fiction writer scientists seems solar system speed speed of light stars story substance Suppose sure surface tachyons temperature theory Theory of Relativity therapsids thing tion turned Universe vapors velocity VTOL weight women write