Which of the following is measured by a unit known as the light year?

Options :
  1. Speed of light
  2. Stellar distances
  3. Speed of rockets
  4. Speed of aeroplanes
Answer and Explanation :-

Answer: Option 2

Explanation:

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A quiet secluded life in the country, with the possibility of being useful to people to whom it is easy to do good, and who are not accustomed to have it done to them then work which one hopes may be of some use then rest, nature, books, music, love for one's neighbor - such is my idea of happiness.
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