On January 5, 2005, astronomers at NASA discovered Eris, the second-largest dwarf planet in the solar system! Read more about this historic discovery here: https://www.space.com/39251-on-this-day-in-space.html | Space.com

Eris: Dwarf Planet King - Eris, the heavyweight champ of dwarf planets, holds the title of the most massive one in our solar system, despite being slightly smaller than Pluto. It's a frosty world residing way out past Neptune, in a chaotic region called the scattered disk. Eris travels on a long, oval-shaped path around the Sun, taking over 550 Earth years to complete one orbit. This mysterious world even has its own moon, Dysnomia, keeping it company in the deep freeze. | The Brain Maze

Beyond the orbit of Neptune, hidden in the deep cold of the Kuiper Belt, lies Eris — a dwarf planet that once changed everything we thought we knew about our Solar System. Discovered in 2005, Eris is slightly smaller than Pluto but even more massive, and its existence forced astronomers to rethink what defines a planet. | The Brain Maze