1. Different planet compositions Explain why planets closer to the Sun have low concentrations of…

1. Different planet compositions Explain why planets closer to the Sun have low concentrations of light elements, but light elements are relatively abundant in giant planets such as Jupiter, Uranus, and Saturn, which are far from the Sun. 2. 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 1011 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 * 108 m>s. What do you need to assume about the stars in order to answer this question?  

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