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24 December, 09:53

One light year is about 9 trillion kilometers. Arcturus is a star that is 37 light years from earth. If you are about 11 years old now, how old will you be when light that is leaving Arcturus today reaches earth? How far, in kilometers, will it have traveled?

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  1. 24 December, 12:01
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    48 years old

    and 333 trillion km
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