Pluto Joined By Up To 50 More Dwarf Planets

Comparative sizes of four dwarf planets, which may be joined by up to 50 more objects. Credit: Hubble Space Telescope

From Cosmos:

SYDNEY: The status of former planet Pluto has taken another blow, with new research suggesting up to 50 known objects may also meet the criteria to be dwarf planets.

To be labelled as a dwarf planet, an object must meet two criteria, as determined by the International Astronomical Union (IAU): they must be 'nearly round' and they must orbit the Sun.

Read more ....