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2. Assuming that the Sun has an orbital speed of 200 km s, find the mass within its orbit at r = 8 kpc. If

2. Assuming that the Sun has an orbital speed of 200 km s, find the mass within its orbit at r = 8 kpc. If this mass is in the form of a spherical dark matter halo, show that its average density would be ~ 0.04 Mo pc

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