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Cepheid variable

Frae Wikipedia, the free beuk o knawledge
RS Puppis is ane o the brichtest kent Cepheid variable starns in the Milky Way galaxy; image, Hubble Space Telescope

A Cepheid variable is a teepe o starn that pulsates radially, varyin in baith diameter an temperatur an producin chynges in brichtness wi a well-defined stable period an amplitude.

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