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12 Mar 2018, 05:00 UTC
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The proper names of the three brightest stars of Leo, the lion, all sound like destinations from a spy thriller: Regulus, Denebola, and Algieba. And the fourth-brightest star sounds pretty exotic, too: Zosma. It’s from a Greek words that means “girdle,” because the star marks the lion’s hip.

Unfortunately, though, the star itself isn’t all that exotic. It’s in the prime of life, so it’s fusing the hydrogen in its core to make helium. It’s the same phase of life the Sun is in, known as the main sequence.

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