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Definition
Castor: A crowded six-star system about 50 light-years from Earth.

Stargazing Tip
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Radio Programs
Displaying 1 to 5 (of 7 total) results | More results »
 Title  Air Date
Moon, Mars, and Gemini November 7, 2009
Moon and Gemini December 14, 2008
Moon, Mars, and Gemini April 12, 2008
Moon and Gemini March 26, 2007
Binocular Vision June 18, 2004

Note: Audio versions of our programs will be available the day after they air. Visit the transcript page to listen.

Image Gallery
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Frequently Asked Questions
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Other Resources

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