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There may be more than a hundred planets in the solar system

27.02.2017

NASA scientists have published a manifesto in which they proposed a new definition of the concept of "planet". If accepted, it would add over a hundred planets to the solar system, including Pluto and our Moon.

Scientists led by Alan Stern (Alan Stern) believe that a cosmic body in the solar system does not have to be in the orbit of the Sun to be considered a planet. What matters is the properties of the bodies, not their interaction with the stars. Stern is the lead investigator on the New Horizons mission, which reached the dwarf planet Pluto for the first time in 2015.

Pluto was decommissioned as a planet in August 2006 and reclassified as a dwarf planet after Caltech astronomer Mike Brown proposed rewriting the definition of planets.

The International Astronomical Union (IAU) has stated that the current definition of a planet in the solar system is: "A celestial body that (a) is in orbit around the Sun, (b) has sufficient mass to become round under its gravitational force, and (c ) has free neighborhoods around its orbit".

It was the last condition - the clean vicinity of the orbit - that did not allow Pluto to maintain the status of a planet.

Stern is dissatisfied with the limitations that this definition imposes. He believes that it is impossible to listen only to astronomers in such a matter. "...You should really listen to a planetary scientist who knows anything about an object. When we look at an object like Pluto, we don't know what else to call it [if not a planet]." Therefore, Stern and his colleagues rewrote the definition of the planet and submitted it to the IAU for consideration. "A planet is a body of substellar mass that is not fusion-producing and has sufficient gravity to assume a spheroidal shape adequately described by a triaxial ellipsoid, regardless of its orbital parameters." In other words, a planet is a round object in space that is smaller than the stars.

The new definition means that our Moon, as well as the moons of other planets - Titan, Enceladus, Europa, Ganymede - will be called planets, including Pluto.

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