The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

The building blocks of life could have been delivered to solar system dwarf planet Ceres by one or more space rocks from the outer asteroid belt.

Pluto was no longer considered a planet and instead became the most famous dwarf planet in the solar system. The IAU’s ...

It is only half as wide as the USA and is smaller than our moon. The solar system contains hundreds of dwarf planets, including Ceres, which can be found in the asteroid belt. Asteroids are made ...