What are the dwarf planets in the Solar System?

The solar system's erratic ninth planet, Pluto, was assigned to the new “dwarf planet” category along with four other bodies, all tinier than Earth’s moon. Some astronomers expect there may be as many as 50 dwarf planets in the solar system. read more

Eyes on the Solar System lets you explore the planets, their moons, asteroids, comets and the spacecraft exploring them from 1950 to 2050. Ride with the Curiosity Rover as it lands on Mars or fly by Pluto with the New Horizons spacecraft all from the comfort of your home computer. read more

It was the first object to be seen in the asteroid belt and was listed as one of the solar system planets for over 50 years. However as more and more asteroid belt objects were discovered Ceres became classed as the largest of the asteroids. read more