New research sheds light on how the “hell planet” got so devilishly hot and how other worlds might become too toasty for life. That rocky world, 55 Cnc e (nicknamed “Janssen”), orbits its star so closely that a year lasts just 18 hours, its surface is a giant lava ocean, and its interior may be chock-full of diamond.
The fresh insights come thanks to a new tool called EXPRES that captured ultra-precise measurements of the starlight shining from Janssen’s sun, known as Copernicus or 55 Cnc...
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