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Exoplanet atmosphere hints it formed far from star

Chemical fingerprint in exoplanet, Osiris, shows unexpectedly high carbon.

Exoplanet HD 209458b transits its star. The illuminated crescent and its colours have been exaggerated to illustrate the light spectra that the astronomers used to identify the six molecules in its atmosphere.
Artists impression of HD 209458b AKA Osiris. Credit: University of Warwick/Mark Garlick