Cepheid variable
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A Cepheid variable is a type of variable star that pulsates radially, varying in both diameter and temperature. It changes in brightness, with a well-defined stable period and amplitude.
RS Puppis, one of the brightest known Cepheid variable stars in the Milky Way galaxy (Hubble Space Telescope)
Illustration of Cepheid variables (red dots) at the center of the Milky Way
Light curve of Delta Cephei, the prototype of classical cepheids, showing the regular variations produced by intrinsic stellar pulsations
John Goodricke
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John Goodricke FRS was an English amateur astronomer. He is best known for his observations of the variable star Algol in 1782.
Marker for John Goodricke in York, England
Goodricke family vault on the grounds of Hunsingore Church.