Technical Comments

Comment on “A Hydrogen-Rich Early Earth Atmosphere”

Science  06 Jan 2006:
Vol. 311, Issue 5757, pp. 38a
DOI: 10.1126/science.1117827

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Tian et al. (Reports, 13 May 2005, p. 1014) proposed a hydrogen-rich early atmosphere with slow hydrogen escape from a cold thermosphere. However, their model neglects the ultraviolet absorption of all gases other than H2. The model also neglects Earth's magnetic field, which affects the temperature and density of ions and promotes nonthermal escape of neutral hydrogen.

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