Astronomy

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

Chandrasekhar Limit

Chandrasekhar Limit

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astronomy

Dark Matter

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Discovery, Distribution, & Facts

Naur, Peter

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Biography & Facts

Oberth, Hermann Julius

Oberth, Hermann Julius

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German scientist

Harriot, Thomas

Harriot, Thomas

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English mathematician and astronomer

Ares

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Rockets, & Facts

MMT Observatory

MMT Observatory

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telescope

Puppis

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astronomy

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