One light year is equal to the distance traveled by light in one year (through empty space). One light year = 1 ly = 6 trillion miles = 9.5 trillion kilometers. Wait a minute! How do we know how far one light year is?.
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One light year is equal to the distance traveled by light in one year (through empty space).
Using the formula d = vt, with
v = c = 3.00 x 105 km/s
t = one year = 3.15 x 107 s
1 ly = 3.0 x 105 x 3.15 x 107 or
Some interesting distances:To star nearest the sun….4 lyTo edge of our galaxy.…. 50,000 lyTo nearest galaxy .......…. 2,000,000 ly