How the light year formula is derived????
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Let's work out how far a light year is.
The speed of light = 300,000,000 m/s (3·00 × 108 m/s).
Length of Earth year = 365 days = 365 × 24 hours = 365 × 24 × 60 minutes = 365 × 24 × 60 × 60 seconds = 3·15 × 107 seconds
Now speed = distance / time ... so ... distance = speed × time
So: 1 light year = 3·00 × 108 × 3·15 × 107
1 light year = 9·46 × 1015 m
That's nearly 9 1/2 million, million kilometres! Phew!!
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