Mira

binary star system in the constellation Cetus From Wikipedia, the free encyclopedia

Mira
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Mira is a binary star system with a white dwarf (Mira B, also known as VZ Ceti) star and a red giant (Mira A). Scientists think Mira is 200-400 light years away in the constellation Cetus. Mira A is a variable star, changing its size and brightness. Other red giant stars that do the same are called Mira variables.

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Mira changes brightness cyclically
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This is a picture of Mira taken by the Hubble Space Telescope.
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Size

Mira has a diameter 332[1] to 541[2] times that of our sun.

If Mira's size was constant, then its diameter would be only 240 times larger than the Sun.[1]

References

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