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Floating in the Universe
2022-10-28
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Geocentric Theory and Heliocentric Theory
2022-10-28
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Launch Center as an Outset of Space Exploration
2022-10-28
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Moon, a Crated World
2022-10-28
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The Amazing Phenomenon of Transit
2022-10-28
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The Brightest Star
2022-10-28
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The Docking of Spacecraft
2022-10-28
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The Emergency Rescue of Astronauts
2022-10-28
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The Lunar Calendar and Solar Calendar
2022-10-28
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The River of Heaven - the Milky Way
2022-10-28
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Moon exploration
2021-12-08
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Artificial earth satellite
2021-12-08
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Mars Program
2021-12-08
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Life cycles of stars
2021-12-08
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The secret of rocket flying
2021-12-08
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Comet and meteor shower
2021-12-08
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Telescopes
2021-12-08
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Light-Year, a unit of distance in the universe
2021-12-08
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Be a stargazer
2021-12-08
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From the Earth to the universe
2021-12-08
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