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A lightyear is 10 000 000 000 000 km. Our own galaxy, the milkyway, is 100 000 lightyears a cross. Wright a lightyear in kilometers as a tenfold.

 Sep 9, 2014

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as an exponent it would be, 10^13 km  does that help you?

 Sep 9, 2014
 #1
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as an exponent it would be, 10^13 km  does that help you?

ThAnswerGuy Sep 9, 2014

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