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A​ parsec, a unit of length used in​ astronomy, is

1.9 times 10 Superscript 131.9×1013

miles. The mean distance of a certain planet from the sun is

1.2 times 10 Superscript 91.2×109

miles. How many parsecs is this planet from the​ sun?

 Oct 28, 2017
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Just divide:

 

[1.2 x 10^9] / [1.9 x 10^13] =6.316 x 10^-5 parsecs =1/15,833 of a parsec.

 Oct 28, 2017

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