How does an object in space formally become a planet? it must be in orbit around the Sun, it needs to have enough gravity, and it needs to have "cleared the neighborhood" of its orbit. Therefore, it was called a planet, but it's not anymore.

2003 was the year that Pluto was not consider a planet anymore. An astronomer (people that study stars, and the sky) found a new object beyond Pluto, this object was bigger than it so they named as ERIS. Some months later a group of astronomers decided to call Pluto "not a planet" because of his location and his small size, they called it "dwarf planet" that means a planet that is around sun orbits but do not have enough gravity to attract all of the space dust.

{C There are many facts about Pluto that are relative to any other planet in space. For example, the diameter of this object is 2370 kilometers. Its density is 2.05 g/cm3. This is not much more than the density of water or even the Sun. Pluto's mass is 1.290 x 1022kilograms, while its volume is 6.545 x 109kilometers3. Temperatures on Pluto can range anywhere from -240°C to -218°C, way below the freezing temperature of water. This is because it is so far away from the Sun and anything on Pluto would freeze. It is 5,913,520,000 kilometers away from the Sun. It takes 5 and 1/2 Earth hours for light from the Sun to reach Pluto, when it takes eight seconds to reach the Earth. The atmosphere is methane, and its winds are not measurable. It takes Pluto 248 Earth years, 197 Earth days, and 5.5 Earth hours to orbit the Sun. It also takes the object 6 Earth days and 9.25 Earthhours to rotate. The tilt of Pluto is 122.52°. Pluto has no magnetic field, mainly because it is made up of frozen methane and other ices.

origin: an astronomer called Tombough was comparing same photos taken of the sky in two weeks interval and than he found a figure that was interesting, something new, so he and the group of astronomers decided to call it Pluto.

There are five revealed moons of Pluto:

  • Charon: At half the size of Pluto, is the largest of Pluto's moons, also it was the first moon found.

  • Nix and Hydra: both of it is small, their names is based on Pluto, discovered in 2005, and they measure about 48 to 165 km.
  • Kerberos: tiny moon with an unusual size, were discovered in 2015 between nix and hydra.
    Pluto moons.png
  • styx: this one was found in the new horizon mission in 2012 , have a small size.


Pluto is located in the Kuiper Belt that is actually a "belt" that goes from the orbit of Neptune to 55 times the distance from the Sun to the Earth.

 New Horizon:

 The New Horizons is a spacecraft that went to the solar system. It is a nine-year trip to reach Pluto. In 2015, New Horizons arrived at Pluto, and they studied it and they took some interesting pictures that nobody could see before.

Icy 'spider'-0.jpg

Icy 'spyder' on Pluto:

The new horizons found something called icy spyder on the surface of Pluto, it's called like that because it looks like a big spider. This "big spider" are some fractures that converge to a same point.

Pluto's orbit:

It takes 248 Earth years for Pluto to complete one orbit around the Sun. Pluto is not located in the same place as the planets, it's a little big farther, his orbit is oval so sometimes Pluto is a lot nearer to the Sun.

Pluto faces.jpg

When Pluto moves closer to the Sun,some of the ice on the surface warm and melt. When it moves away from the Sun, the gases cool and refreeze. They used many telescopes and stuff to find the Pluto surface, also it may change in few years.

Cool Pictures of Pluto:

[1] {C [2] {C [3]

Chart: Date Accessed: September 28, 2008
{C Pluto's Planet Classification: Tiffany =) 01:14, 29 September 2008 (UTC) Date Accessed: September 28, 2008
Pluto and Charon: Date Accessed: September 28, 2008;jsessionid=830D31A523A2D14360E70208E05F4D18.c05?act=0-7758972-1224788188_3c05

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