Astronomers measure large distances in light-years. One light-year is the distance that light can travel in one year, or approximately 5.88 *10^12 miles. Suppose a star is 3.2 * 10^2 light-years from Earth. In scientific notation, approximately how many miles is it?

a. 1.88 x 10^12
b. 5.88 x 10^14
c. 3.2 x 10^15
d. 1.88 x 10^15

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  1. d = 5.88*10^12mi/light-yr. * 320light-yrs. = 1.88*10^15 miles.

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