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The galaxy that contains our solar system, the milky way, is approximately a uniform disc of...

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Physics

The galaxy that contains our solar system, the milky way, isapproximately a uniform disc of mass 10^12Msun and diameter175×10^3 light years. Assuming that the center of mass of thegalaxy is at rest, estimate the time that it takes the sun tocomplete one orbit around the galaxy center. A few useful numbers:the mass of the sun Msun = 2 × 10^30kg, 1 light year = 9.46 ×10^15m, and the distance between the sun and the galaxy center d =26.4 × 10^3 light years.

Use the viral relation PE = -2 KE, and estimate the periodusing, t=2pir/v

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3.7 Ratings (420 Votes)
GivenMass of the Sun The mass of the galaxy One light year Diameter of the galaxy light yearsDistance between the Sun    See Answer
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