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What is the fourth most abundant element in the universe in terms of mass?
The six most common elements in our galaxy are as follows:

Hydrogen: 74%
Helium: 24%
Oxygen: 1.04%
Carbon: 0.42%
Neon: 0.13%
Iron: 0.11%

             These values, obtained by spectroscopy, will give accurate estimates for local regions of the universe.


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