Hohmann transfer orbit
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Apsis
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Trans-lunar injection
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Kosmos 21
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Viking 1
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Clementine (spacecraft)
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Analemma
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Vanguard 1
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Dactyl (moon)
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Giotto (spacecraft)
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Andromeda Galaxy
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Earth shelter
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Bay of Fundy
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Eclipse cycle
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Explorer 1
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Timeline of Solar System astronomy
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2060 Chiron
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Philosophiæ Naturalis Principia Mathematica
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Low Earth orbit
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243 Ida
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Halley's Comet
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Saturn
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Pluto
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Geostationary orbit
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Jupiter
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MGM-31 Pershing
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AD 141
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1866
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Wake Island
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Vostok 1
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Planets beyond Neptune
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Orbital resonance
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Ottoman Empire
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Near-Earth object
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Galileo project
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Globular cluster
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General relativity
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Apoapsis
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