Question

question 4 of 5
who made the official decision to downgrade pluto from a planet to a dwarf planet?
a. the museum of natural history
b. the hayden planetarium
c. the international astronomical union
d. the new york times

Explanation:

The official body governing astronomical definitions and classifications made this decision in 2006, establishing the criteria for planets and dwarf planets.

Answer:

C. The International Astronomical Union