Simplify the expression. Write the answer using scientific notation.
Astronomers measure large distances in light-years. One light-year is the distance that light can travel in one year, or approximately 5,880,000,000,000 miles. Suppose a star is 15.8 light-years from Earth. In scientific notation, how many miles away is it?
would this be 1.58 x 10^12 miles?
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Step 1. Write 5,880,000,000,000 in scientific notation. That is 5.88 x 10 ^ 12 I think. Do you think so too?
That's the distance it moves in one light year. To find out how many light years it moves in 15.8 years, you should multiply 5.88 x 10 ^2 x 15.8 = ???
Hope that helps.
Oops, should have been:
5.88 x 10 ^ 12 x 15.8. I missed the one in the 10^12 by accident. Sorry.