Home Videos Today in Science! Jan 5th – Dwarf Planet Eris Discovered! #science #solarsystem #space #history

Today in Science! Jan 5th – Dwarf Planet Eris Discovered! #science #solarsystem #space #history

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#onthisday in 2005, the second-largest dwarf planet in our Solar System, Eris, was discovered on images taken on 21 Oct 2003. Mike Brown, Chad Trujillo, and David Rabinowitz announced their discovery on 29 Jul 2005. Eris is slightly smaller than Pluto, and orbits the sun about three times farther Pluto. At first, Eris appeared to be slightly larger than Pluto, and for a while seemed to be a candidate as the tenth planet.

However, in 2006, the International Astronomical Union (IAU) adopted a rigorous definition of a planet. Pluto no longer qualified. Both Eris and Pluto are now classified as “dwarf planets”, each slightly smaller than Earth’s Moon. Eris is named for the ancient Greek goddess of discord and strife for the definition debate it caused.

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