Dwarf planet Timeline of Events

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Dwarf planet

A dwarf planet, as defined by the International Astronomical Union , is a celestial body orbiting the Sun that is massive enough to be spherical as a result of its own gravity but has not cleared its neighboring region of planetesimals and is not a satellite...

Timeline of Events

1735

7.11.1735

Mathematical calculations suggest that it is on this day that dwarf planet Pluto moved inside the orbit of Neptune for the last time before 1979.

2003

10.21.2003

Images of the dwarf planet Eris are taken and subsequently used in its discovery by the team of Michael E. Brown, Chad Trujillo, and David L. Rabinowitz.

2005

1.5.2005

Eris, the largest known dwarf planet in the solar system, is discovered by the team of Michael E. Brown, Chad Trujillo, and David L. Rabinowitz using images originally taken on October 21, 2003, at the Palomar Observatory.

2006

8.24.2006

The International Astronomical Union (IAU) redefines the term "planet" such that Pluto is now considered a Dwarf Planet.