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Astronomy 150 - Exam #1 Name:October 22, 1999 TA’s Name & Section (2 pts):Answer all questions in the space provided. If you have any questions, raise yourhand. 100 points possible.1 (6 pts) You have discovered a planet, Planet X , that is one half the radius of the Earthand one half as massive. How does the gravity on the surface of Planet X compare to theEarth? [show your work]2 (4 pts) You measure the uncompressed density of Planet X to be 5.0 g/cm3. What isthe most likely composition of the planet?3 (6 pts) Planet X orbits a star exactly like our Sun. If Planet X is the same distancefrom its star as the Earth is from the Sun would you expect it to have an atmosphere?Explain why or why not.10 20 30 40 5012453Temperature (C)SolidLiquidGasPressure (atm)On your long trip to Planet X your foodsupply is a substance called Soylent Green. Usethe phase diagram Soylent Green (shown of theleft) to answer the next three questions.4 (2 pts) If the temperature in this roomwere 20◦C what phase would Soylent Green bein? (check one) Solid Liquid Gas5 (4 pts) In this room Soylent Green would freeze at◦C and boil at◦C.6 (8 pts) You place some Soylent Green in your hand (at room temperature) and slowlycompress to 5 atmospheres. Describe the changes the Soylent Green goes through as youcompress it. Be quantitativein your answer.PlanetX7 (2 pts) To the left is a diagram of the or-bit of your spacecraft around Planet X .The best time to communicate with theEarth is when your spacecraft is movingthe slowest. Mark on this diagram theplace in the orbit where your spacecraftis moving the slowest.CEEADB8 (5 pts) From orbit around Planet X youcreate the geological map on the left.Indicate the relative ages of the variouslandforms from oldest (1, formed first) toyoungest (5, formed last).A - Lava FlowB - Cratered TerrainC - Crater and EjectaD - Straight Rille (Fault)E - Sinuous Rille9 (8 pts) You measure the crater density on the “Lava Flow” to be much less than that onthe Lunar Mare. Based on the crater density alone, why may it be wrong to conclude thatthe age of the “Lava Flow” is less than that of the Lunar Mare?10 (5 pts) How could you determine the actual age of the “Lava Flow”?From orbit around Planet X you observe three planets with the same mass and size asthe Earth. You measure the atmospheric pressure and the composition of a few gases intheir atmospheres (see table below).Pressure Atmospheric gases[atm] Hydrogen Oxygen Carbon DioxidePlanet A 2 0% 10% 1%Planet B 10 35% 0% 1%Planet C 0.01 0% 0% 95%11 (6 pts) Which planet is furthest from the center star? Explain how you determined thatbased only on the data above.12 (6 pts) Which planet is closest to the center star? Explain how you determined thatbased only on the data above.13 (6 pts) Which planet is most likely to have liquid water on its surface? Explain how youdetermined that based only on the data above.After landing on the surface of Planet X the first thing you do is explore the area outsidean impact crater and collect rocks as you approach the crater’s rim. Back in the lab youdetermine what type of rocks you found by making thin-sections. The data is shown in thetable on the


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UW ASTR 150 - Exam Guide

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