Astronomy

Mukai Chiaki

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Japanese doctor and astronaut

Olbers’ Paradox

Olbers’ Paradox

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astronomy

Observable Universe

Observable Universe

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Size, & Facts

Las Campanas Observatory

Las Campanas Observatory

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observatory, Chile

Protoplanet

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astronomy

Mercury

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Facts, Color, Size, & Symbol

Fomalhaut

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Location, Astrology, & Facts

Serpens

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constellation

Astronaut

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Facts, & Training

Betelgeuse

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Size, Dimming, Color, Meaning, & Facts

Large Binocular Telescope Observatory

Large Binocular Telescope Observatory

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observatory, Arizona

Eratosthenes

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Biography, Discoveries, Sieve, & Facts

Pulkovo Observatory

Pulkovo Observatory

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observatory, Saint Petersburg, Russia

Gliese 581

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extrasolar planetary system

Messenger

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United States spacecraft

Space Debris

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Facts, Removal, & Examples

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