"What other celestial objects (besides the sun) have a strong enough gravitational pull to distort the orbital paths of some planets such as Pluto?"
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Oxygen in Earth's Early Atmosphere
October 11, 2007 / Posted by: Shige Abe
Researchers from NAI’s Carnegie Institution of Washington Team have a paper in this week’s Nature describing evidence that Earth’s Mesoarchean atmosphere (3.2 and 2.8 Gya) possessed very low amounts oxygen. These findings contrast with prior claims that Earth’s atmosphere underwent its first rise in oxygen during the Mesoarchean, and indicate that oxygen first rose above parts per million levels sometime between 2.45 and 2.4 billion years ago.
Source: [Link]
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