Chemistry
Pie Chart of Elemental Abundance in the Universe
Last reviewed on 2026-05-22.
Chemistry — verifiable data, editable template
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By mass, the observable universe is roughly 74% hydrogen and 24% helium, with all other elements combined making up only ~2%. These two elements were formed in the Big Bang.
The data
- Hydrogen — 73.9 %
- Helium — 24.0 %
- Oxygen — 1.04 %
- Carbon — 0.46 %
- Neon — 0.13 %
- Iron — 0.11 %
- Other — 0.36 %
Source
Standard cosmological elemental abundance.
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