Pluto was once classified as the 9th planet in our solar system. Because it was so far out, we knew very little about it and the images that we had were just grey and blurred.
All of this changed when the New Horizons space mission did flybys around Pluto and we had the opportunity to see high resolution pictures as well as the fact that Pluto has 5 moons.
|Discovered By:||Clyde W. Tombaugh February 18th 1930|
|Mass:||1.31 × 10^22 kg (0.17 Moons)|
|Orbit Distance:||5,874,000,000 km (39.26 AU)|
|Orbit Period:||248.0 years|
Pluto was listed as a planet from 1930 until 2006. It is the second closest dwarf planet to our sun and was once thought to be the largest dwarf planet.
After the New Horizons mission, it was found that the dwarf planet Eris is actually just a bit larger.
Many seemed to be under the misunderstanding that Pluto was named for a cartoon character with the same name.
In reality, an 11-year old girl in England, named Venetia Burney, suggest that it be named after the mythological Roman god that was the match to the Greek character Hades, the god of the underworld.
Pluto was discovered in 1930 by an astronomer at the Lowell Observatory in Flagstaff, AZ.
Clyde Tombaugh found Pluto by accident when he was searching for an unknown planet that many called “Planet X.”
They thought that this unknown planet was causing disturbances in the orbits of Neptune and Uranus.
Tombaugh compared photographs and found a faint small spot that he thought had moved.
It was then that they classified Pluto as a planet and made the assumption that there really wasn’t any Planet X.
Over the years, the misunderstanding of the name created a rather deep affection for what was considered at that time to be our 9th planet.
In 2006, Pluto was downgraded to a dwarf planet and this caused outrage from people all over the world.
Children wrote letters to the IAU (International Astronomical Union) and specifically to astrophysicist Neil deGrasse Tyson, to register their complaints.
It does show that people had a connection with that little planet that was both wonderful and confusing.
The discovery of the 5 moons of Pluto was thanks to the 2015 New Horizon space mission.
Named: Charon, Styx, Nix, Kerberos, and Hydra, Charon is the largest of these moons and tidally locked to Pluto.
This means that Charon has only one side that always faces Pluto. Our own moon is tidally locked to Earth and that’s why we always only see one side of the moon.
The Pluto-Charon relationship is also considered to be a binary system or double-dwarf planet.