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NASA reported that Webb observations are refining the boundary between giant planets, brown dwarfs and the smallest stars.
The dividing line may depend not only on mass but also on formation history and atmospheric properties.
Webb's infrared spectroscopy helps probe objects too cool and faint for many earlier instruments.
Why It Matters
The planet-star boundary affects how scientists classify worlds and model formation across the galaxy.
What to Watch
Watch follow-up spectra and whether classification frameworks shift toward formation-based definitions.
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