Density of our galaxy Estimate the average density of particles in our galaxy, assuming that the most abundant element is atomic hydrogen. There are about 109 stars in the galaxy and the size of the galaxy is about 105 light-years. A light-year is the distance light travels in 1 year moving at a speed of 3 X 108 m/s. What do you need to assume about the stars in order to answer this question?
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