‘Ultrahot Neptune’ discovered around sunlike star

Astronomers have discovered a new type of alien world — the first known “ultrahot Neptune,” a giant planet that orbits its star 60 times closer than Earth does the sun, a new study finds.

Previous research found that about 1 in 200 sunlike stars possesses a planet that circles its star so tightly that it orbits in less than one Earth day. Astronomers call these worlds “ultra-short-period planets.” (In contrast, Earth takes slightly more than 365 days to circle the sun; Mercury, our sun’s closest planet, takes less than 88 days to complete its year.)

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