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The haziest planet we’ve ever seen won’t give up its secrets

Something is hiding inside Kepler-51d, and it’s doing a remarkably good job of it. About 2,615 light-years away in the constellation Cygnus, this peculiar world orbits a young Sun-like star every 130 days. It’s roughly the size of Saturn. Its mass, however, is only a few times that of Earth, making it so unimaginably light for its size that planetary scientists sometimes compare it to cotton candy. Now, NASA’s James Webb Space Telescope has star…
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Since telescopes search the exoplanets, they reveal worlds very different from those we know. Some planets are larger than Jupiter, others turn so close to their stars that they are distorted. Kepler-51d intrigues for another reason. It is immense, but almost empty, and this extreme lightness raises a simple question that still remains unanswered. An almost empty planet with giant dimensions At more than 2,600 light-years in the constellation of…

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Brighter Side News broke the news in on Saturday, March 21, 2026.
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