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    elements, cosmic abundance

    cosmic abundance of elements
    In the universe as a whole, hydrogen is by far the commonest element followed by helium and more distantly by heavier elements such as oxygen and carbon. Locally, the proportion of heavy elements varies from one star system to another and is an influential factor in the formation of planets.


    Number of atoms per 10,000,000 of hydrogen
    hydrogen 10,000,000 sulfur 95
    helium 1,400,000 iron 80
    oxygen 6,800 argon 42
    carbon 3,000 aluminum 19
    neon 2,800 sodium 17
    nitrogen 910 calcium 17
    magnesium 290 all other elements 50
    silicon 250    


    Related entries

       • elements, biological abundance
       • elements, terrestrial abundance


    Related category

       • COSMOLOGY



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