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Astronomy 150 – Final Name:June 11, 2003 – Spring 2003 TA’s Name & Section:Answer all questions in the space provided. If you have any questions, raise your hand.100 points possible. No calculators.1 (3 pts) How do you get a piece of an asteroid from the asteroid belt to the surface of the Earth?(a) Most asteroids will eventually explode, sending pieces to the Earth.(b) Impacts can break pieces off, sending them flying directly to the Earth.(c) Alien spacecraft inadvertently pick them up and deliver them during their frequent visits to Earth.(d) Impacts can disrupt the asteroid, and interaction with Jupiter will send the pieces to Earth.(e) We can never get pieces of asteroids.2 (6 pts) Describe how the visible appearance of Jupiter would change if it rotated in 30 hours instead of10 hours.3 (8 pts) The volcanoes on Neptune’s moon Triton are being powered by the Sun. The nitrogen ice onTriton’s surface acts as a greenhouse material that prevents infrared radiation form escaping. Where doesthis infrared radiation come from? Remember, the ice also blocks the infrared radiation from the Sun!On the next two pages are four False statements. For each of these statements, explain what is wrongwith the argument. All of these arguments come from seemingly serious web pages, really they do.4 (8 pts) “Short period comets are disintegrating so fast that after ten thousand years there will not be anyremaining. Since we still see comets in our skies, the solar system must be very young.”5 (8 pts) “The prevailing theory for the origin of the asteroids – this collection of highly visible “debris”orbiting between the planets Mars and Jupiter – is that these, indeed, were the results of a formerly explodedplanet.”6 (8 pts) “If the planets and their 63 known moons evolved from the same material, they should have manystaggering similarities. After several decades of planetary exploration, this expectation is now recognized asfalse. For example, the moons of Saturn are composed of ice while the Earth’s moon is composed of rock.”7 (8 pts) “The radioactive decay of Uranium produces not only lead but also helium. The helium passesinto the Earth’s atmosphere, but the amount of helium in the atmosphere is too small. It would only requiresome thousands of years to produce what is there. There should be much more helium if the process hasgone on for millions of years.”050100−50−100050100 150 200Time (days)Radial Velocity (m/s)The table on the right shows the observational data fortwo planets orbiting two stars exactly like our Sun.Planet Period Maximum Radial[Days] Velocity [m/s]A 50 50B 800 1008 (8 pts) On the graph above, draw how the radial velocity of each of the two planets would change over 200days of observations (label each line). Assume that the planets have a radial velocity = 0 m/s on Day = 0.9 (2 pts) Which planet is more massive?  A  B10 (2 pts) Which planet is closer to the star?  A  B11 (6 pts) In class I said that Carbonaceous Chondrite meteorites are composed of “primitive” materials.Describe what is meant by “primitive” materials.0.0RedBlue Green Yellow Orange InfraredReflectanceWavelength1.00.51.52.0AABBCCOn the left is the reflectance spectra of threedifferent regions on the surface of Jupiter’smoon Io. The spectra were taken in an areaaround a volcanic caldera. Use these spectrato answer the questions on this page.12 (6 pts) Describe the color and brightness of the three regions if you were to observe them visually.21313 (3 pts) To the left is a visible light imageof the area where the three spectra weretaken. Match each of the three numberedregions with one of the above spectra. Sincethis is a black and white image you will haveto rely on clues other than color.Region #1Region #2Region #314 (6 pts) Notice that the for region C the reflectance in the infrared is greater then 1.0. Explain why thisis.For the next two questions, assume that the Sun will remain unchanged for the next 10 billion years.15 (8 pts) Describe the geological activity of the Earth 10 billion years from now (4pts) and what the surfaceof the Earth may look like (4pts).16 (8 pts) Describe the geological activity of Jupiter’s moon Io 10 billion years from now (4pts) and whatthe surface of Io may look like (4pts).17 (2 pts) And finally, list the top 100 objects in the solar


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UW ASTR 150 - Exam Guide

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