Planets, like those in our solar system, form in a bottom-up process where small bits of rock and ice clump together and grow larger over time. But the heftier the planet, the harder it is to explain its formation that way. Astronomers used NASA’s James Webb Space Telescope to examine 29 Cygni b, an...
NASA’s Webb Redefines Dividing Line Between Planets, Stars
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April 14, 2026 •
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NASA
