SCIENCE

Physical - Chemistry

Most Common Elements in Space

This list features the most common elements in space.

RANK	ELEMENT	ABUNDANCE %	MASS FRACTION (ppm)
1	Hydrogen	74%	739,000
2	Helium	24%	240,000
3	Oxygen	0.9%	10,400
4	Carbon	0.0025%	4,600
5	Neon	0.0018%	1,340
6	Nitrogen	0.0017%	1,090
7	Iron	0.0013%	960
8	Magnesium	0.0012%	650
9	Silicon	0.0007%	580
10	Sulfur	0.0002%	440

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References

Brau, J. (2015). Abundance of elements in the universe. Available at: https://pages.uoregon.edu/jimbrau/astr122-2015/Notes/Chapter16.html [Accessed 1 December 2025]. World Atlas (2023). The most common elements in the universe. Available at: https://www.worldatlas.com/space/the-most-common-elements-in-the-universe.html [Accessed 1 December 2025].

SCIENCE

Physical - Chemistry

Most Common Elements in Space

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