Atmospheres of TRAPPIST-1 planets

Atmospheres of TRAPPIST-1 planets
Atmospheres of TRAPPIST-1 planets The Hubble observations revealed that the planets do not have hydrogen-dominated atmospheres. The flatter spectrum shown in the lower illustration indicates that Hubble did not spot any traces of water or methane, which are abundant in hydrogen-rich atmosphere. NASA / ESA / Z. Levy (STSci)

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