from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. an astronomical object with enough mass to achieve hydrostatic equilibrium, but not enough initiate core fusion at any time in its existence. That is, it is rounded in shape and is smaller than a star. Planemos include planets, dwarf planets, and the larger moons of the Solar System, but also sub-brown dwarfs and rogue planets between the stars.


from Wiktionary, Creative Commons Attribution/Share-Alike License

Contraction of planetary-mass object. Coined by Gibor Basri, Professor of Astronomy at the University of California, Berkeley, (UCB) at the 2003 IAU conference.


  • Vision, there is a definition of a planetary mass object, called appropriately "planemo".

    The Speculist: Um, no

  • The only objects remaining with more than [[planemo | planetary mass]] will be [[brown dwarf]] s, with mass less than 0.08 solar masses, and [[compact star | degenerate remnants]]: [[white dwarf]] s, produced by stars with initial masses between about 0.08 and 8 solar masses, and

    Conservapedia - Recent changes [en]


Log in or sign up to get involved in the conversation. It's quick and easy.

  • Planemo is an acronymic rendering of the initialism PMO (planetary mass object). It was coined by Professor Gibor Basri, an astronomer at UC Berkeley. "I think I came up with it in about 2005," Prof. Basri told me. "It appears in my review article in 2006: 'Planetesimals to Brown Dwarfs: What is a Planet,' 2006, Ann. Rev. Earth & Planetary Sci., 34, 193, Basri, Brown." — The Orthoepist

    December 6, 2010

  • This also means "we pounce!" in Slovene!

    October 20, 2009

  • Planetary-mass objects that were formed in a similar way as stars, yet do not orbit normal stars.

    October 19, 2009