The Astronomy Center has provided educational resources to introductory astronomy educators since 2003. Over the past 20 years, the rapid pace of discovery has rendered some of our linked resources obsolete. Thus, the Astronomy Center will be decommissioned on March 1, 2022. Our highest quality resources will be retained on


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Publisher: American Association of Variable Star Observers
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Variable Star Astronomy, formerly published as Hands-On Astrophysics, was developed for anyone interested in astronomy and in learning more about the behaviors and properties of…
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D. Dutkevitch
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In this activity students find a number of Cepheid variables in the galaxy M100. They then use their periods, average apparent magnitudes, and the Period-Luminosity relationships to…