1,000,000,000 light-years (one billion light-years) are in one Gly
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3.26 light years equals 3.08413226 × 10^13 kilometers.
440 light years = 2.58653992 × 1015 miles
10 10ths is 1 - whether it is miles, milometres, micrometres or lightyears, or pounds, or people or anything.
two different units of measure. It's like asking how many seconds in a mile.But there are 365.25 light days in a light year if you assume a day = 86,400 seconds and you use the Julian definition of a year.