Astronomy
Pie Chart of a Comet Nucleus Composition
Last reviewed on 2026-05-22.
Astronomy — verifiable data, editable template
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Comet nuclei are 'dirty snowballs' — mostly water ice, with dust, frozen gases, and complex organic molecules. Composition of a typical comet nucleus.
The data
- Water ice — 50 %
- Dust & rock — 30 %
- CO and CO₂ ice — 10 %
- Methane & ammonia — 5 %
- Organic compounds — 5 %
Source
ESA Rosetta mission / 67P/Churyumov–Gerasimenko measurements.
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