95 years of the discovery of Pluto, considered the ninth planet until 2006

He was considered the ninth and smallest planet of the Solar System by the International Astronomical Union and for public opinion from its location in 1930 to 2006,-when he was reclassified as a dwarf planet-, although his definition has always been subject to controversy Among astronomers.

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For many years there was a belief that Pluto was a satellite of Neptune that had ceased to be a satellite due to the fact of reaching a second cosmic speed. However, this theory was rejected in the 1970s.

After an intense debate, and with the proposal of Uruguayan astronomers Julio Ángel Fernández and Gonzalo Tancredi before the General Assembly of the International Astronomical Union in Prague, Czech Republic, it was decided unanimously in 2006 to reclassify Pluto as the dwarf planet, requiring that a Planet must have orbital dominance. Its classification was proposed as a planet in the resolution draft, but disappeared from the final resolution, approved by the General Assembly of the UAI. Since September 7, 2006, it has the number 134340, awarded by the Minor Planet Center.

But since then, many scientists who believe that Pluto must be a planet again. But not because it has a climate, an atmosphere in layers, possible organic compounds, liquid oceans and their own moons, as experts reason based on scientific evidence reason, but because it has been learned in schools, an argument also valid for society for Pluto’s preservation as a planet.

Pluto has an eccentric and highly inclined orbit with respect to the ecliptic, which runs through his perihelio to the interior of Neptune’s orbit. It also has five satellites: Caronte, Nix, Hidra, Cerbero and Estigia, which are celestial bodies that share that same category, Wikipedia reports.

Its great distance to the sun and the earth, together with its small size, prevents it from shining above the magnitude 13.8 in its best moments (orbital perihelio and opposition), so it can only be appreciated with telescopes from the 200 mm opening, photographically or with CCD camera. Even in his best moments he appears as a timely star of stellar appearance, yellowish, without distinctive features (apparent diameter of less than 0.1 seconds of arch). It was not until 2015 when the New Horizons space probe passed over the planet and allowed to clearly appreciate its real appearance.