2025年1月22日 · Our solar system has five dwarf planets. In order of distance from the Sun they are: Ceres, Pluto, Haumea, Makemake, and Eris. Pluto and other dwarf planets are a lot like regular planets. So what’s the big difference? The International Astronomical Union (IAU), a world organization of astronomers, came up with the definition of a planet in 2006.

A dwarf planet is a small planetary-mass object that is in direct orbit around the Sun, massive enough to be gravitationally rounded, but insufficient to achieve orbital dominance like the eight classical planets of the Solar System.

2025年1月17日 · dwarf planet, body, other than a natural satellite (moon), that orbits the Sun and that is, for practical purposes, smaller than the planet Mercury yet large enough for its own gravity to have rounded its shape substantially.

2022年11月10日 · The dwarf planet classification has existed only since 2006 and its exact definition is still a work in progress. The main differences between a planet and a dwarf planet are orbital dominance and hydrostatic equilibrium. Dwarf planets are …

According to the International Astronomical Union (IAU), there are 8 planets and 5 officially recognized dwarf planets in our solar system. These 8 planets are “Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune”.

2023年1月31日 · 3 Dwarf Planets: Pluto, Eris, and Ceres most closely meet the criteria for dwarf planets. Some astronomers exclude Ceres because of its location and consider it a large asteroid, but not a dwarf planet. Pluto has at least five moons, while …

2017年10月28日 · Meet the dwarf planets of our solar system, Pluto Eris, Haumea, Makemake and Ceres. (Image credit: Karl Tate, SPACE.com contributor) As of 2014, the IAU recognizes five named dwarf planets:...

2024年8月10日 · Five officially recognized dwarf planets exist in our solar system: Ceres, Pluto, Haumea, Makemake, and Eris. Pluto is the largest dwarf planet with a diameter of approximately 2,374 kilometers. Eris is the farthest dwarf planet from the Sun, orbiting at an average distance of 96 astronomical units.

As their name suggests, the main difference between a dwarf planet and a planet is size. Because they are smaller, dwarf planets lack the gravitational forces needed to pull in and accumulate all of the material found in their orbits. Each known dwarf planet in our solar system is actually smaller than Earth's Moon!

All eight planets the Sun in their own unique way. Dwarf planet is a new class of astronomical objects. It was created in 2006 by the International Astronomical Union as part of their struggle to define the word 'planet'.