An 11-year-old girl from England is credited with naming Pluto in 1930.
Uranus only has two seasons - summer and winter. Each lasts 42 Earth years.
If the Earth were the size of a grain of sand, the sun would be the size of an orange.
The flag of Mars is a tricolour used by the Mars Society and The Planetary Society to represent the planet Mars.
Earth’s atmosphere is, proportionally, thinner than the skin of an apple.
If the world were tilted one degree more either way, the planet would not be habitable because the area around the equator would be too hot and the poles would be too cold.