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	Search Results for Cepheus Search Type: Keywords | Results: Radio Programs | Images | FAQs | Other Resources | Search Again Definition Cepheid variable: An unstable star whose brightness changes periodically. In 1912, Henrietta Leavitt discovered what is known as the Period-Luminosity Relationship for Cepheid variables, by which the period of the brightness change is related to the luminosity, and therefore the distance, of the star. More » Stargazing Tip No stargazing tips found. Check the Sky Almanac for more information. Radio Programs Displaying 1 to 5 (of 6 total) results | More results »  Title  Air Date Gamma Cephei March 25, 2009 Mu Cephei October 18, 2007 Bad Neighbor December 2, 2006 Gamma Cephei February 25, 2006 Another Step August 4, 2005 Note: Audio versions of our programs will be available the day after they air. Visit the transcript page to listen. Image Gallery No results found for Cepheus (keywords). Frequently Asked Questions No results found for Cepheus (keywords). Other Resources
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