A dwarf planet is a planetar-mass object that is neither a planet nor a naitural satellite. That is, it is in direct orbit o the Sun, an is massive enough for its gravity tae crush itsel intae a hydrostatic equilibrium shape (uisually a spheroid), but haes nae cleared the neighbourhuid o ither material aroond its orbit.
|Four notable dwarf planets (clockwise from top left):
(See full leet o likeliest possible dwarf planets.)
- "Definition of a Planet in the Solar System: Resolutions 5 and 6" (PDF). IAU 2006 General Assembly. International Astronomical Union. 2006-08-24. Retrieved 2008-01-26.
- "IAU pdf" (PDF).