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The interstellar gas has approximately the same composition of the sun: about 74% Hydrogen, 23% Helium and 2% of larger elements. This 2% consists of all the various elements found on earth. They were produced by stars that lived and died during the 14 billion years that the universe has existed. The hydrogen and helium was produced in the aftermath of the big bang. Some of the atoms are bonded to each other to produce simple molecules like water, carbon monoxide, methane. All the material can be placed in 4 categories: 98% gas, 1.4% ice, 0.4 % rock and 0.2% metal. Hope this helps!

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9y ago

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