Mira star

Mira star

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Caption: Mira variable star. Hubble Space Telescope image of the star Mira (Omicron Ceti). It is a variable red giant star that changes in brightness by a factor of around 1700 over a period of some 331 days. Mira is a huge star some 700 times the size of the Sun. It has an irregular shape, possibly an effect of its rapid expansion and contraction. It has a white dwarf companion star (not seen) separated from it by around 10.5 billion kilometres (some 70 times the Earth-Sun distance). The Mira system is thought to lie around 420 light years from Earth in the constellation Cetus. Image taken by the Faint Object Camera on the HST.

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Keywords: astronomical, astronomy, astrophysical, astrophysics, cetus, faint object camera, foc, giant, hst, hubble space telescope, long-period, mira, omicron ceti, optical, red, science, star, stellar, universe, variable

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