Astronomy 150 – Final Name:Decemb er 16, 2009 – Autumn 2009 TA’s Name & Section:Answer all questions in the space provided. If you have any questions, raise your hand.100 points possible. No calculators or electronic devices of any type.1 (3 pts) Jupiter takes about 12 years to orbit the sun. An asteroid in 4:1 resonance with Jupiter wouldorbit the sun in how many years?(a) 3 years(b) 48 years(c) 12 years(d) 16 years(e) 1/4 year2 (3 pts) A small (< 200 km) object formed at a distance of 0.5 AU from the sun would have a density of about(a) 1 g/cm3(b) 3 g/cm3(c) 8 g/cm33 (3 pts) A small (< 200 km) object formed at a distance of 15 AU from the sun would have a density of ab out(a) 1 g/cm3(b) 3 g/cm3(c) 8 g/cm34 (3 pts) A planet with a mass of 10 times that of Jupiter will have a size(a) 10 times greater than Jupiter(b) 10 times less than Jupiter(c) about the same as Jupiter(d) that can have any value5 (3 pts) Which of the following atmospheric gasses would be a strong indicator of a potentially biologicallyrich world?(a) Carbon Dioxide (CO2)(b) Ozone (O3)(c) Nitrogen (N2)(d) Methane (CH4)6 (8 pts) Describe how you can determine the composition of the surface of an asteroid without having asample.7 (8 pts) Explain how we can determine how far an e xtrasolar planet is from its star, even though we cannotsee the planet.8 (8 pts) I have said that we cannot use crater counting to determine the ages of the worlds in the outersolar system. Describe what the evidence is that supports this statement.9 (8 pts) Venus, Earth, Mars, and Titan are terrestrial worlds with secondary atmospheres. Explain whythe composition of Titan’s atmosphere is very different from the composition of Venus’ atmosphere.10 (6 pts) On the right is an image of a slice of a meteorite.Identify the meteorite and describe the characteristics of thisslice that identifies it.11 (5 pts) Is this sample primitive? Explain.12 (8 pts) Describe the approximate size, shape, density, and moment-of-inertia of the parent body ofthis sample.13 (8 pts) Explain why Io would not be tidally heated if it had a perfectly circular orbit around Jupiter.14 (8 pts) Describe two pieces of evidence that imply most of the asteroids in the asteroid belt are small insize (< 500 km). [Going to the asteroid belt and taking pictures is not one of them.]15 (8 pts) Explain why accretion is not very efficient for particles that are very close to giant planets suchas Saturn.16 (8 pts) Explain why accretion is not very efficient for particles in the very outer regions (> 30 AU) ofthe solar system.17 (2 pts) And finally, list the top 100 objects in the solar
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