| 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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