Pluto a Planet No More


The International Astronomical Union (IAU) voted to demote Pluto from the ranks of the solar system’s now 8 planets. The decision comes as Pluto no longer fits the newly ratified definition of a planet decided upon by the IAU this week. The new definition states that a planet is “a celestial body that is in orbit around the sun, has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a …nearly round shape, and has cleared the neighborhood around its orbit.

The new Solar System :

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