As always, WolframAlpha is your friend:
http://www.wolframalpha.com/input/?i=3+millilight+seconds
558.8 miles or 899.4 kilometers
They even have "comparisons", e.g. for 30 millilight seconds:
~~ 1.4 x Amazon River length (~~ 6400 km )
http://www.wolframalpha.com/input/?i=3+millilight+seconds
558.8 miles or 899.4 kilometers
They even have "comparisons", e.g. for 30 millilight seconds:
~~ 1.4 x Amazon River length (~~ 6400 km )
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