ast2037_hw2_fall2037_solns - This reduced the mass of the...

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Astronomy 2037 – Homework #2 Due at the beginning of class on 7 October 2010 1. Is there a “Dark Side” of the Moon? Why or why not? No – all sides of the Moon are exposed to sunlight once per orbit (about every 28 days). 2. How do we know nuclear fusion really is happening in the Sun’s core? We can see the neutrinos being produced from the nuclear reactions. 3. Why are terrestrial planets small and rocky, while Jovian planets are large and gaseous? Describe in 4-6 sentences. Terrestrial planets are close to the Sun. When they were forming, the higher temperatures there made it easier for light elements to escape.
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Unformatted text preview: This reduced the mass of the proto-planets, which weakened their gravity even more, which made it even EASIER for light elements to escape. What was left behind was a small amount of very dense elements and molecules mostly rocks and metals like nickel and iron. The outer planets were much cooler, so the molecular velocity of light elements was much less than the escape velocity. Since most of the material in the early solar system was hydrogen and helium (like the Sun itself), the outer planets held onto this material, and are mostly gaseous hydrogen and helium today....
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This note was uploaded on 07/26/2011 for the course AST 2037 taught by Professor Eikenberry during the Fall '08 term at University of Florida.

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