One light year is equivalent to roughly how many kilometers?

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OPSC OAS 2023 Prelims (General Studies) Official Paper-I
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  1. 1.5 trillion kilometers
  2. 4.5 trillion kilometers
  3. 7.5 trillion kilometers
  4. 9.5 trillion kilometers

Answer (Detailed Solution Below)

Option 4 : 9.5 trillion kilometers
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Detailed Solution

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The Correct answer is Option 4. 

Key Points

  • A light year is the distance light travels in a vacuum in one year.
  • The speed of light is approximately  299,792 kilometers per second.
  • Over a year (approximately  31,536,000 seconds), light travels about  9.46 trillion kilometers, which is commonly rounded to 9.5 trillion kilometers.
  • Thus, the correct answer is indeed Option 4
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