February 27, 2017

Homework Help: Physics - mass of a galaxy

Posted by Farah on Saturday, December 4, 2010 at 5:16am.

A star at the edge of the Andromeda galaxy appears to be orbiting the center of that galaxy at the speed of about 200km/s. The star is about g*10^9AU from the center of the galaxy. Calculate a rough estimate of the mass of the Andromeda galaxy. Earth orbital radius is 1.40*10^8

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