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Railways PYQCBT 1 2016

RRB NTPC · Question 96

The astronomer who discovered planet Pluto was _______ A. Sylvain Arend B. Joseph Ashbrook C. Edwin Hubble D. Clyde Tombaugh

  1. C

  2. A

  3. B

  4. D

Show answer & explanation

Answer: (D) D

Explanation

American astronomer Clyde Tombaugh discovered Pluto on 18 February 1930 at the Lowell Observatory in Arizona, by comparing photographic plates of the night sky. Pluto was reclassified as a dwarf planet in 2006.