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According to the geophysical planet definition, (GPD), a planet is a sub-stellar mass objected in space that is round by self gravity, regardless of its orbit[1][2]. This definition has been used implicitly in the professional literature for decades[3]. Dwarf planets and round moons are counted as planets, which are not required to “clear their neighborhood” as in the IAU planet definition. With over 120 dwarf planets in the Kuiper Belt[4], dwarf planets are the most common type of planet in the Solar System.

Professional planetary scientists commonly refer to planets as being terrestrial planets, gas giant planets, ice giant planets, and dwarf planets [5].

  1. ^ Runyon, Kirby (March, 2017). "A GEOPHYSICAL PLANET DEFINITION" (PDF). Lunar and Planetary Science Conference Abstracts: 2. Retrieved 23 August 2019. {{cite journal}}: Check date values in: |date= (help)
  2. ^ Runyon, Kirby. "An Organically Grown Planet Definition". Astronomy.com. Retrieved 23 August 2019.
  3. ^ Runyon, Kirby (July, 2019). "Dwarf planets are planets, too: Planetary pedagogy after New Horizons" (PDF). Pluto System After New Horizons Workshop Abstracts. Retrieved 23 August 2019. {{cite journal}}: Check date values in: |date= (help)
  4. ^ Brown, Mike. "How many dwarf planets are there in the outer solar system?". Retrieved 23 August 2019.
  5. ^ "What Are Gas Giants And Ice Giants?". Retrieved 23 August 2019.