# Question

It takes 3x10⁷ years for a particular star to make one orbit around its galaxy. Assume that this star’s orbit in its galaxy is circular with a diameter of 10⁴ light years. A light year is the distance that light travels in one year. There are about 5.859x10¹² miles in 1 light-year. Estimate how many miles this star travels in one year.

The star travels about _____ miles in one year.

Number of years required

Distance travelled

3 x 107 years

Star’s orbit = circumference =

= π x 104 light years

= π x 104 x 5.859 x 1012 miles

= 5.859 π x 1016 miles

1 year

x

The star travels about _____ miles in one year.

Number of years required

Distance travelled

3 x 107 years

Star’s orbit = circumference =

= π x 104 light years

= π x 104 x 5.859 x 1012 miles

= 5.859 π x 1016 miles

1 year

x

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