Answers to most question about the planets, solar system and the rest of the universe can be found on the relevant pages of the site but if you are having trouble finding a particular fact this could help point you in the right direction.

Frequently Asked Questions about Pluto

Is Pluto a planet?
No, Pluto is a Dwarf Planet

Why is Pluto not a planet?
It does not meet the criteria set out by the IAU in 2006 to qualify as a planet.

How big is Pluto?
Pluto’s diameter is thought to be around 2,368 km.

When was Pluto discovered?
Pluto was discovered on the 18th of February 1930.

Who discovered Pluto?
Clyde W. Tombaugh discovered Pluto.

What is Pluto made of?
Pluto is roughly one third water ice and two thirds rocky material.

What colour is Pluto?
Pluto appears to be primarily brown.

How cold is Pluto?
The temperature on Pluto is between -233 to -223 degrees Celsius.

How many moons does Pluto have?
So far 5 have been discovered in orbit of Pluto; Charon, Nix, Hydra, Kerberos and Styx.


What Is

What is a Planet?


How Many

How many planets are there? 8
How many dwarf planets are there? 5

How many moons does Mercury have? 0
How many moons does Venus have? 0
How many moons does Earth have? 1
How many moons does Mars have? 2
How many moons does Jupiter have? 67
How many moons does Saturn have? 62
How many moons does Uranus have? 27
How many moons does Neptune have? 14
How many moons does Pluto have? 5

How many rings does Jupiter have?
How many rings does Saturn have?
How many rings does Uranus have?
How many rings does Neptune have?


How Big

How big is the Sun?Visualised
How big is the Moon?
How big is Mercury?
How big is Venus?
How big is the Earth?
How big is Mars?
How big is Jupiter?
How big is Saturn?
How big is Uranus?
How big is Neptune?
How big is Pluto?