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A Light Year is the distance travelled by light in vacuum in one year. How many metres are there in one light year? (Noor asked)
Answer:
Speed of light in vacuum is 3 x 108 m/s
1 year = 365 days = 365 x 24 hours=365 x 24 x 60 minutes = 365 x 24 x 60 x 60 seconds
We know that distance = speed x time
Therefore,
1 LY = 3 x 108 x 365 x 24 x 60 x 60 m = 9.460528405×1015 m
