Pluto

The first planet discovered by mathematics.
Discovered in 1930 by American Astronomer Clyde William Tombaugh at the Lowell Observatory in Arizona. The discovery was in fact an accidental, as he had been trying to locate a mysterious ‘Planet X’ which had incorrectly been thought to exist. His ashes were placed on board the Nasa spacecraft New Horizons.
How big is Pluto? Pluto is very small, it has a diameter of 2,320 km; it is about a fifth of the size of planet Earth
Surprising fact: Pluto isn’t always the planet that’s furthest from the sun!
For 20 years of the planets orbit around the sun it is closer in range than planet Neptune. This last occurred in 1999 and won’t happen again until around the year 2227
Pluto is so far away from the sun that one orbit takes nearly 250 years to complete!
Pluto was the smallest and furthest planet from the Sun in our solar system, now it is not even officially recognized as a planet!
In 2006 Pluto was demoted to the status of dwarf planet.
Because it is so far away from the sun it is very cold with temperatures ranging from -235 Degrees Celsius to -210 Degrees Celsius.