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

Explanation:

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I do not know how much they see through the Mist. I doubt it would matter to them if they knew the truth. Sometimes mortals can be more horrible than monsters.
-Rick Riordan The Titan's Curse