| The
Material Available |
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| Solar composition by mass |
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| Element % by # % by mass |
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| H
91.0 70.9 |
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| He
8.9 27.4 |
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| O
0.07 0.8 |
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| C
0.03 0.3 |
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| Ne
0.01 0.2 |
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| N
0.008 0.1 |
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| Fe
0.003 0.1 |
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| Si 0.003 0.07 |
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| Mg 0.003 0.06 |
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| S 0.002 0.04 |
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| • | Inner
solar system dominated by silicate rocks |
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| – | SiO2 (quartz) Mg2SiO4 Fe2SiO4
(olivine) etc. |
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| • | Outer solar system dominated by H2, He,
ice (H2O) |
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