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    Animation of a variable star

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    Hubble Space Telescope

    von Hubble Space Telescope

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    This artist's illustration shows a star turning into a variable star, expanding and shrinking — growing brighter and dimmer as it does so.

    More information and download options:
    http://www.spacetelescope.org/videos/heic1323j/

    Credit: NASA, ESA, M. Kornmesser