The American astronomer 'Clyde William Tombaugh' discovered the dwarf planet 'Pluto' in which of the following years?

Options :
  1. 1920
  2. 1930
  3. 1940
  4. 1950

Answer and Explanation :-

Answer: Option 2


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A sailor chooses the wind that takes the ship from a safe port. Ah, yes, but once you're abroad, as you have seen, winds have a mind of their own. Be careful, Charlotte, careful of the wind you choose.
-Avi The True Confessions of Charlotte Doyle