Castor

A crowded six-star system about 50 light-years from Earth. It forms one of the "heads" of the twins of Gemini, and is Gemini's second-brightest star, after nearby Pollux.

Radio Programs

 Castor The twins and triplets of Gemini Monday, May 16, 2011
Moon, Mars, and Gemini A pair of unrelated twins Saturday, November 7, 2009
Moon and Gemini The Moon and the twins of Gemini Sunday, December 14, 2008
Moon, Mars, and Gemini A logjam in the western sky Saturday, April 12, 2008

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