Twinkle, twinkle, variable star
Despite the tumultuous and extreme conditions within our sun, its energy output varies only slightly—about 0.1%. Take a look at a red giant, though, and you could witness variabilities thousands of times that over the course of a single year. A great example of this is the first pulsating variable star ever discovered—Mira. Why does Mira behave this way, and what does it tell us about the fate of our own sun? Find out in this month's column! [PDF]
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