Formation of the Earth's Atmosphere and Oceans

How did the Earth Get to Look Like This?

Key points in the formation of the earth:

The original atmosphere of the Earth, Venus and Mars consisted of Hydrogen and Helium. Those light elements, however, were heated to escape velocity by solar radiation and thus this atmosphere escaped. The current atmospheres of the Earth, Venus and Mars are therefore secondary and evolved from other processes.

Overview of Atmospheric Compositions:

Outgassing --> Early Formation of the Earth's Atmosphere

Present day composition of volcanoe effluents:

It is likely that there was NOT enough water released via outgassing to account for the present day oceans

Most of the water was likely delivered to the earth after it formed via collisions with left over planetisimals and cometisimals. The influence of Jupiter on the orbits of leftover cometisimals may well be key.

Tidal forces from a newly formed moon may also be key in promoting first stages of development of life as well.

Hence the earth may need both Jupiter and the Moon if it is to ask a question sometime later.

Formation of Planetary Atmospheres:

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