forbidden planet

noun

Any exoplanet that cannot be explained by the usual theories of planet formation.

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Meanings

nounforbidden planet (plural forbidden planets)

plural forbidden planets

  1. astronomyAny exoplanet that cannot be explained by the usual theories of planet formation.

Origin

So called because the theories would appear to forbid their existence. Possibly influenced by the 1956 science-fiction film Forbidden Planet.

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Cite this entry
APA

forbidden planet. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/forbidden%20planet

MLA

“forbidden planet.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/forbidden%20planet. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “forbidden planet,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/forbidden%20planet.

Source: forbidden planet on Wiktionary, CC BY-SA 4.0.