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Assume that the disk of the Milky Way has a diameter of 39.7 kpc and has...

Assume that the disk of the Milky Way has a diameter of 39.7 kpc and has a surface area R^2. Likewise, each star covers an area determined by R^2.

a. If the Milky Way contains 100 billion stars each the size of the Sun, what fraction of the galaxy's disk is actually "covered" by a star? ____× 10^−13 of the galaxy's disk is covered by a star.

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