A. September 24, 2006
B. April 28, 2004
C. January 26, 2006
D. August 24, 2006
Submitted by: Agha Hussain
The International Astronomical Union (IAU) downgraded the status of Pluto to that of a dwarf planet because it did not meet the three criteria the IAU uses to define a full-sized planet. Essentially Pluto meets all the criteria except one- it “has not cleared its neighboring region of other objects.”
In August 2006 the International Astronomical Union (IAU) downgraded the status of Pluto to that of “dwarf planet.”
Correct Answer: August 24, 2006 ✔
Last Updated: February 21, 2019