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A Galaxy at a Time
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ancient astronomer atoms attraction average Babylonian begin body calculated calendar called calorie catalyst celestial equator centimeters century chemical cm/sec consider constellation diameter discovered distance dyne Earth eclipse ecliptic electric charge electromagnetic force electrons energy equal fact five fluorine frequency galaxy gram gravitational force Greek Gregorian calendar heartbeat hundred hydrogen inert gases instance joule Julian Julian calendar Jupiter latitude light light-years live longitude Mars mass means measure meridian miles million minutes molecules Moon Moon's move Neptune night sky nucleus object observer Olbers orbit oxygen particles physicist Planck Planck's constant planet planetoids platinum Pole positrons radiation ratio reason represent Roche limit Roman numerals rotation Saturn shared pool shell sidereal day solar day Solar System stars sulfur sulfur dioxide supernova suppose sure surface symbols temperature thousand tion true satellite tug-of-war value turned units universe Uranus Venus vernal equinox visible xenon