Why is Pluto not a planet?

Possibly in the annals of astronomy, July 2015 will be registered as the month of Pluto , until nine years ago the ninth planet and the most distant from the solar system, and now in the foreground thanks to the passage of the NASA space probe, New Horizons, and the first close images of this former planet.

Ascent and fall to the edge of the solar system

Although the space probe data served to determine that Pluto's diameter was slightly larger than what had been estimated, it is still considered a dwarf planet, similar to other celestial bodies that move in the Belt of Kuiper , and not a planet like the other eight traditional members of the solar club (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune).

Celestial objects in the Kuiper Belt

The debate The nature of Pluto began a few decades after its discovery, made by the American astronomer Clyde William Tombaugh in 1930, due to its small size, its orbit around the sun a little eccentric and far away.

Pluto takes a little more than 248 years to orbit the sun, and at that time it becomes 20 years closer to the star king than Neptune, which made the theory propose to some astronomers that it was a satellite of Neptune that managed to escape the gravity of this planet (as our moon would do in the very distant future).

This theory was ruled out in 1970, but shortly before the end of the 20th century Pluto received a new barrage, this time from the astronomer Brian Marsden , who proposed in 1999 to place Pluto with the largest-sized asteroids and with the so-called trans-Neptunian objects (celestial objects beyond Neptune).

Pluto's status as a plane It continued downhill in the new millennium, due to the discovery of several celestial objects, especially in the Kuiper Belt, with diameters similar to those of Pluto: Quaoar in 2002, Sedna in 2004 and Eris in 2005.It was even believed that Eris was larger in size than Pluto, but New Horizons measurements suggest that Pluto would remain king among these objects.

What is a planet?

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