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UW ASTR 150 - Exam Guide

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Astronomy 150 - Exam #1 Name:October 25, 1996 TA’s Name & Section (2 pts):Answer all questions in the space provided. If you have any questions raiseyour hand. 100 points possible.1 (5 pts) You have discovered an airless planet orbiting between the Sun and Mercury. Youmeasure its uncompressed density to be ρ = 6 gm/cm3and its albedo to be A = 0.12.Describe the approximate composition of this planet.2 (10 pts) A region on Mercury has 100 impact craters per square kilometer. A region onVenus has 50 impact craters per square kilometer. How do the relative ages of these twosurfaces compare?3 (5 pts) If you wanted to find the absolute ages of these two surfaces how would you dothat?4 (5 pts) If you were to triple the size of the Earth (increase its radius by a factor of three)and triple the mass of the Earth, how much would it change the gravity on the Earth (howmuch would your weight change)? [show your work]6 (3 pts) What is the property of CO2and H2O that makes them greenhouse gases?[Because they cause the greenhouse effect is not a good answer.]7 (10 pts) Explain how the greenhouse effect works. Use the Earth’s atmosphere as anexample.8 (4 pts) This is an image of a thin–section of aLunar rock we saw in class. If this were a colorimage you would notice that the material appears greyto slightly yellow. What type of rock is this? (check one) Mare Basalt Impact Breccia Lunar Regolith Plutonic Rock Orange Soil9 (4 pts) What are the characteristics of the thin–section that you used to answer theabove question?10 (4 pts) How was the rock that this thin-section came from formed?11 (4 pts) Where on the Moon would you expect to find this rock?12 (4 pts) Why would you expect to find this rock there?13 (3 pts) Explain what it means for a planetary surface to have saturation cratering.14 (10 pts) Choose one theory of the origin of the Moon other than the Giant Impacttheory (i.e. Co-Accretion, Capture, or Fission) and describe two properties of the Moon orEarth–Moon system that this theory does a good job of explaining.15 (7 pts) Why can’t liquid water exist on the surface of Mars today? Describe two surfacefeatures that indicate that water ice exists in the subsurface of Mars.16 (20 pts) This image shows a portion of the Moon near the Apollo 14 landing site. Writea paragraph or two describing the surface features you see (use your planetary vocabulary)and their relative ages. If you can not determine the relative ages of some of the featuresexplain why you can not. Feel free to draw a simple geological map to make your pointsclear (use the back of this page if


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UW ASTR 150 - Exam Guide

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