Observations of a distant galaxy indicate that on average, a start at a distance of 10 kpc from its center (2 billion astronomical units) has an orbital speed of 300 km/s, and thus takes about 200 million Earth-years to complete one orbit. Using Keplers laws as modified by Newton, determine the mass of the galaxy that lies within this orbital distance.

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     4 x 108 solar masses
      2 x 1011 solar masses
      4 x 1012 solar masses
      8 x 109 solar masses
      6 x 1010 solar masses
asked Sep 20, 2012 in Astronomy by anonymous
    

1 Answer

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2 x 1011 solar masses
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)

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