Variable Stars

A star whose brightness changes periodically. There are many types of variable stars and their brightnesses vary for many different reasons. For example, the brightness of a Cepheid variable star changes because its luminosity changes; the luminosity change is related to the internal structure of the star and the processes that occur there. Variable stars can also be caused by eclipsing dark or bright companions.

Radio Programs

More Polaris A “hiccup” for the North Star Friday, October 24, 2014
John Goodricke Solving the mystery of a demon star Wednesday, September 17, 2014
Enif The leading lights of Pegasus Wednesday, September 10, 2014
Fast Radio Bursts Mysterious outbursts of radio waves Wednesday, February 12, 2014
Outbursts Flickering lights in the night sky Tuesday, February 11, 2014
Orion’s Footstool A resting spot for the hunter Saturday, February 1, 2014
Moon and Antares A bubbly stellar supergiant Wednesday, September 11, 2013
Side Jobs A space telescope gets some extra jobs Tuesday, March 5, 2013
Polaris II The un-steady beat of the North Star Wednesday, February 20, 2013
First Steps Angling in on the stars Wednesday, December 5, 2012
RR Lyrae The rhythmic beat of a star Tuesday, December 4, 2012
R Trianguli Turmoil at the end of a star’s life Sunday, November 4, 2012
Halloween Star A two-headed stellar demon Tuesday, October 30, 2012
Moon and Spica Two bright stars for the price of one Wednesday, July 25, 2012
Mira A wonderful but doomed star Sunday, November 14, 2010
Algol The head of the demon Saturday, October 30, 2010
Delta Capricorni Sweeping past a busy star system Monday, December 7, 2009
Eta Aquilae The rhythm of a pulsating star Thursday, September 10, 2009
Delta Scorpii A star that periodically "burps" Tuesday, July 28, 2009
M3 A great view of the Milky Way Monday, May 11, 2009

Featured Images

Speeding Star Saturday, December 8, 2007
Dusty Skies Monday, September 24, 2007

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