2 Answers

The distance of light can travel in one year. In one year there is 365 day of 24 hrs. Each hour has 60  minutes and each minute is 60 seconds long. So, 60s/min x 60min/hr x 24hr/day x 365 = 31,536,000s.  It would take you 3 years to get to number 31,536,000.

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1 light year is the distance traveled by the light in 1 year through vacuum.

So, 1 light year = distance traveled by the light in 1 year

But, distance traveled = speed of light × time taken

= 3 × 10 raised to the power 8 × 1 year

But 1 year = 365 days = 365 × 24 hours = 365 × 24 × 60 minutes = 365 × 24 × 60 × 60 seconds

So, 1 light year = 3 × 10 raised to the power 8 × 365 × 24 × 60 × 60

i.e. 1 light year = 9.46 × 10 raised to the power 12 kilometer or 9.46 × 10 raised to the power 15 meter [Approximate value]

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