Given that the nearest star is about 4 light years away, Physics

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Given that the nearest star is about 4 light years away

Given that the nearest star is about 4 light years away, a) develop an estimate of the density of stars per cubic light year in our galaxy.

b) estimate the number of stars in the milky way galaxy given that it's roughly a disk 100 000 light years across and a thousand light years thick.

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