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mini-Neptune
From Wiktionary, the free dictionary
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English
Noun
mini-Neptune (plural mini-Neptunes)
- (astronomy) A planet less massive than Neptune but resembling Neptune in that it has a thick hydrogen-helium atmosphere, probably with deep layers of ice, rock or liquid oceans (made of water, ammonia, a mixture of both, or heavier volatiles).
- Synonyms: gas dwarf, transitional planet
References
mini-Neptune on Wikipedia.Wikipedia
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