a round object in space that goes around the sun but is not as large as a planet 矮行星（以轨道绕着太阳的球状天体，体积不及行星，未能清除在轨迹上的其他天体） the dwarf planets Pluto, Ceres, Eris, Makemake and Haumea 冥王星、谷神星、阋神星、鸟神星和妊神星等五颗矮行星 These bodies have been classified as dwarf planets. 这些天体被归类为矮行星。