Planck star

noun

A hypothetical astronomical object whose energy is around the Planck density (5.155 × 10⁹⁶ kg/m³).

First used 21st c.
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Meanings

nounPlanck star (plural Planck stars)

plural Planck stars

  1. astrophysicsA hypothetical astronomical object whose energy is around the Planck density (5.155 × 10⁹⁶ kg/m³).First known use 21st c.

    The entire matter of the sun condensed into the space of an atom: a Planck star should be constituted by this extreme state of matter.

    2015, Carlo Rovelli, translated by Simon Carnell and Erica Segre, Seven Brief Lessons on Physics, Penguin, published 2016, page 44

Translations

Japanese プランク星
  • プランク星 (puranku sei)hypothetical astronomical object whose energy is around the Planck density
Polish gwiazda Plancka
  • gwiazda Planckahypothetical astronomical object whose energy is around the Planck density
Cite this entry
APA

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

MLA

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

Chicago

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

Source: Planck star on Wiktionary, CC BY-SA 4.0.