Composition
ELEMENT     ABUNDANCE                                ABUNDANCE
                        (percentage of total number of atoms)      (percentage of total mass)
Hydrogen             91.2                                             71.0
Helium                 8.7                                               27.1
Oxygen                0.078                                           0.97
Carbon                 0.043                                           0.40
Nitrogen              0.0088                                         0.096
Silicon                 0.0045                                         0.099
 Magnesium        0.0038                                          0.076
 Neon                  0.0035                                          0.058
Iron                     0.0030                                          0.14
Sulfur                  0.0015                                          0.040