Eris Discovered, Prompting IAU Planet Definition Debate – January 5, 2005

The dwarf planet Eris is discovered by Palomar Observatory-based astronomers, later motivating the International Astronomical Union (IAU) to define the term planet for the first time.

The dwarf planet Eris is discovered by Palomar Observatory-based astronomers, later motivating the International Astronomical Union (IAU) to define the term planet for the first time.

Date: January 5, 2005

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