Which of the following was the last planet discovered, in 1930?
A
Uranus
B
Pluto
C
Neptune
D
Saturn
Correct Option:
B
Explanation
Pluto was discovered in 1930 by Clyde Tombaugh and was then classified as the ninth planet. Since 2006, the International Astronomical Union has classified Pluto as a dwarf planet, so the question uses the historical classification current before that change.
