Rare Pulsating Star Is 1 of only 7 in Milky Way (IMAGE)

Southern Methodist University

Rare Pulsating Star Is 1 of only 7 in Milky Way

Caption

A star -- as big as or bigger than our sun -- in the Pegasus constellation is expanding and contracting in three different directions simultaneously on a scale of once every 2.5 hours, the result of heating and cooling of hydrogen fuel burning 28 million degrees Fahrenheit at its core.

Credit

Palomar Observatory Sky Survey

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