sister planet

noun

a planet that shares similar physical characteristics, such as size, density and mass, with another planet

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Meanings

nounsister planet (plural sister planets)

plural sister planets

  1. astronomya planet that shares similar physical characteristics, such as size, density and mass, with another planet
Cite this entry
APA

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

MLA

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

Chicago

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

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