3. Why is Pluto Not Considered a Planet?

When Pluto was discovered, it was mistakenly thought to be as big as Jupiter. In fact, it's smaller than our moon. To be fair, from its discovery, Pluto was the misfit of the solar system. Not only did it go undiscovered for so long, but there were dwarf planets that were even bigger than it was. For scientists, that meant that if they classified Pluto as a planet, those bodies such as another dwarf planet, Eris, would also have to be considered planets. Funnily enough, it was Eris's discovery that put the wheels in motion for Pluto to be denounced.

pluto and the sun dottedhippo / Getty Images

More on Facty


This site offers information designed for educational purposes only. The information on this Website is not intended to be comprehensive, nor does it constitute advice or our recommendation in any way. We attempt to ensure that the content is current and accurate but we do not guarantee its currency and accuracy. You should carry out your own research and/or seek your own advice before acting or relying on any of the information on this Website.