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	Search Results for Cepheid Variables 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 7 total) results | More results »  Title  Air Date Eta Aquilae September 10, 2009 Stellar Yardsticks March 27, 2009 Galactic Distances May 1, 2008 Standard Candles October 17, 2007 The North Stars March 27, 2006 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 Cepheid Variables (keywords). Frequently Asked Questions No results found for Cepheid Variables (keywords). Other Resources StarDate Online | News | Hipparcos Data Could Change Universe's Size http://stardate.org/resources/news/universe/199706.html StarDate Online | News | Universe Doesn't Look a Day Over 12 Billion Years Old http://stardate.org/resources/news/universe/199908.html
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