Description
It takes 3x10^ 7 years for a particular star to make one orbit around its Galaxy. Assume that this stars orbit in its Galaxy is circular with a diameter of 10^5 light years. There are about 5.859x10^12 miles in 1 light year. Estimate how many miles this star travels in one year.
Scientific notation and round to one decimal place if needed
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the star travel 2pi*10^5 lys,
so it is 2pi*10^5*5.859 x10^12=3.681*1018 miles
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