On This Day: Pluto is demoted – HISTORY

In Prague on August 24, 2006, the International Astronomical Union votes to demote Pluto from the ninth planet from the Sun to one of dozens of known dwarf planets.

The vote followed a week of debate by the IAU, who voted on multiple proposals including one that kept not just Pluto as a planet but added two new planets—the asteroid Ceres and Pluto’s moon Charon. The ultimate proposal defined the word “planets” (which comes from the Greek word planets, or “wanderers”) supposedly once and for all: planets are celestial objects large enough to be made rounded by their gravitational orbit around the Sun and to have pushed away nearby planetary objects and debris. Two years later, the IAU decided on a name for dwarf planets similar to Pluto—“plutoid”—grouping Pluto with Eris.

Source link

Grayman Share
Author: Grayman Share

Be the first to comment

Leave a Reply

Your email address will not be published.