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29 Cygni B Weighs 15 Times as Much as Jupiter and Should Have Been Born as a Star: Webb Has Just Discovered in His Light Something that Has Nothing to Do with It

Summary by SciencePost
The James Webb telescope has just solved a cosmic debate: 29 Cygni b, a giant planet of 15 Jovian masses, has formed as a planet and not as a failed star. Its chemical signature revealed by Webb proves that it has grown slowly, challenging the expectations of astronomers. More
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The James Webb telescope has just solved a cosmic debate: 29 Cygni b, a giant planet of 15 Jovian masses, has formed as a planet and not as a failed star. Its chemical signature revealed by Webb proves that it has grown slowly, challenging the expectations of astronomers. More

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SciencePost broke the news on Tuesday, July 7, 2026.
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