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The mass enclosed within the visible-light edge of the Milky Way, at 16 kpc, is how...

The mass enclosed within the visible-light edge of the Milky Way, at 16 kpc, is how many times the mass enclosed within our orbit, at 8 kpc?

A. 1

B. 2     

C. 4

D. 8

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Answer #1

We know the mass M enclosed within the visible-light edge of the Milky way, at distance r is directly proportional.

  

  

  The mass enclosed within the visible-light edge of the Milky Way, at 16 kpc, is 2 times the mass enclosed within our orbit, at 8 kpc.

The answer is (B) 2.

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