How Old are the First Planets

by Keith Cooper for Astrobiology Magazine
Moffett Field CA (SPX) Aug 31, 2012To build a planet you need lots of rubble and that means lots of heavy elements - stuff more massive than atoms of hydrogen and helium. The elemental composition of the collapsing nebula that gave birth to the Sun and the planets of the Solar System included things like iron, silicon and magnesium that form the bulk of rocky planets, and carbon, oxygen, nitro

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http://www.spacedaily.com/reports/How_Old_are_the_First_Planets_999.html

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