Pluto gets 'demoted' again.

After being " dethroned " by the solar system planet in 2006 and placed in the group of dwarf planets, Pluto was once again downgraded to a lower rank by the dwarf planet Eris.

When redefining the word ' planet ', the International Astronomical Society (IAU) in the capital of Prague has formed a group of dwarf planets with the leading Pluto because they believe that this is the largest celestial body in the group. But two American astronomers Michael Brown and Emily Schaller proved the opposite when studying the Dynomia satellite of the dwarf planet Eris.

Thanks to Keck observatory and Hubble telescope, they measured the movement of Dysmonia and from this information deduced Eris's mass was 27% larger than the mass of Pluto.

The Earth has 360 times the mass of Eris.

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