Pluto is no longer a planet and has been re-categorized as a Dwarf Planet. Pluto was considered a planet until 2006. Pluto is smaller than the moon and there are white mountains on its surface, but the white caps are not made of snow but methane frost. A year on Pluto is 248 Earth years and a day is 153 hours which is about 6 days. Pluto also has 5 Moons and it is a very cold planet because of its distance from the Sun.