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Elements found on Neptune include:

Molecular hydrogen (H2) - 80.0%

Helium (He) - 19.0%

Methane (CH4) - 1.5%

Hydrogen Deuteride (HD) - 192ppm

Ethane (C2H6) - 1.5ppm

Ammonia ice

Water ice

Ammonia hydrosulfide

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12y ago

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