Picture of Pluto

Pluto, plus moons: Charon, Nix & Hydra.

A recent discovery has resulted in Eris being found to be smaller than Pluto[1].

Here is What Wikipedia has to say about Pluto: “Pluto, formal designation is 134340 Pluto. Pluto’s size has been under debate since the discovery of Eris.

Pluto is now the largest dwarf planet in the Kuiper Belt (a part of our Solar System) followed by Eris [1].

The largest dwarf planet in our solar system is Ceres which also happens to be the largest asteroid, and protoplanet. Ceres orbits inside the asteroid belt.

“I give my rebuttal, Pluto is a planet:”

picture of pluto the dog

Pluto is not happy with being sent to the dog house!

IAU sends Pluto to the dog house: On August 24, 2006, the International Astronomical Union (IAU) defined what it means to be a “planet” within the Solar System. definition excluded Pluto as a planet and added it as a member of the new category “dwarf planet” along with Eris and Ceres.

A number of scientists continue to hold that Pluto should be classified as a planet.


Pluto has five moons: Charon (the largest, with a diameter just over half that of Pluto), Nix, Hydra, Kerberos, and Styx.

The moons Kerberos and Styx were only discovered in 2011–2012. A spacecraft will be flying by Pluto in 2015 and that might result in rings or debris system being found around the dwarf planet as meteoroids that strike those satellites (moons).

New Horizons spacecraft will make a close flyby of Pluto at a height of only 10, 000 km from its surface (on earth that would be close enough to see individual buildings).

Shortened link to this post: Pluto, The Planet (not dwarf planet):”


[1] NASA information on Eris–accessed Mar 2013, Wiki (Solar System) –accessed Mar 2013

[2] 🚀 ScienceCasts: One Year to Pluto (New Horizons Spacecraft) [ video ]: ♇ (spacecraft is due to arrive at Pluto in July 2015)

Contacts that might provide information of interest about New Horizons arrival at Pluto in July 2015


Last edited in Jul 2014

Shortened link to article: ☆ Pluto [article]:

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3 Responses to Pluto

  1. There is no reason to accept the IAU demotion, done by four percent of its membership, as fact when it is only one side in an ongoing debate. An equal number of professional astronomers continue to reject the demotion. In fact, the term “dwarf planet” was coined by Dr. Alan Stern, Principal Investigator of New Horizons, to refer to a third class of planets in addition to terrestrials and jovians, small planets large enough to be rounded by their own gravity but not large enough to gravitationally dominate their orbits. He never meant for dwarf planets to not be considered planets at all. The media has been doing a disservice by treating the IAU view as fact rather than as the interpretation it is. Sigificantly, in astronomy, dwarf stars are still stars, and dwarf galaxies are still galaxies.

  2. Also, Pluto is now the largest dwarf planet in our solar system, given that in November 2010, Eris was found to be marginally smaller than Pluto. This was determined when Eris occulted a star, allowing scientists to get more accurate data on Eris.

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