This poor dwarf planet has been recently eliminated from the list of the "adult" planets of the Solar System. Besides being a minor planet, Pluto is also very distant from the Sun.

It takes 248 years for Pluto to orbit our star! This orbital period is the longest among all the other planets of the Solar System. Moreover, the surface of the dwarf planet is covered with stones and ice and the average temperature varies from -387 to -369 F.