Pluto was discovered in 1930 by an astronomer named Clyde Tombaugh. He was from the United States and was a scientist who studied stars and other objects in space. Pluto is also known as a dwarf planet; its largest moon is named Charon which is about half the size of Pluto. Pluto is considered to have five moons in all.
Pluto is about 40 times farther from the sun than Earth is. Therefore, Pluto is very cold, even colder than Antarctica. In addition, Pluto has less gravity than Earth which means a person would weigh much less on Pluto than Earth. In the summer of 2015, spacecraft New Horizons flew by Pluto and its moons. It took almost 10 years to travel that far from earth.