The decision to classify Pluto as a dwarf planet was made by:
A) its discoverer Clyde Tombaugh in 1930
B) the president of the U.S. Naval Observatory in 2001
C) the International Astronomical Union in 2006
D) the Secretary General of the United Nations in 2001
E) a vote of the majority of Americans in 2006

Question

Quizplus · Accepted Answer

The decision to classify Pluto as a dwarf planet was made by the International Astronomical Union in 2006 during their General Assembly in Prague. This decision came after years of scientific debate and discussion amongst astronomers and planetary scientists.

The Decision to Classify Pluto as a Dwarf Planet Was