Phrase guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
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noun
Any exoplanet that cannot be explained by the usual theories of planet formation.
Definition source: English Wiktionary via Wiktextract
Topics: astronomy, natural-sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
So called because the theories would appear to forbid their existence. Possibly influenced by the 1956 science-fiction film Forbidden Planet.
