In 2006, the International Astronomical Union (IAU) famously demoted Pluto to a dwarf planet. Things have been a bit of a mess since then — so is it time to redefine the planet?

The Pluto problem: Is it time to rethink our definition of a planet?

Source: space
Source Link: https://www.space.com/pluto-problem-time-to-rethink-definition-of-a-planet