The duration of time required for the Solar System to orbit once around the center of the Milky Way Galaxy is known as

Options :
  1. Parsec
  2. Astronomical year
  3. Cosmic year
  4. Light year
Answer and Explanation :-

Answer: Option 3

Explanation:

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All this will not be finished in the first one hundred days. Nor will it be finished in the first one thousand days . . .nor even perhaps in our lifetime on this planet. But let us begin.
-John F. Kennedy