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SCIENCE

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Physical - Chemistry

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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].
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