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[as Dashboard Courses Fal 2023 Home Syllabus Announcements Assignments Grades Modules People Pages |Quines Learner Support Resources Learner Support Resources Zoom 202380.AST2002.82741 > Quizzes > Milky Way Galaxy (Quiz) Milky Way Galaxy (Quiz) a* Started: Nov 11 at 9:33pm Quiz Instructions Make sure you have read through and watched the videos for Milky Way Galaxy before attempting this quiz. You have three attempts on this quiz. Only your highest score will be kept. Note that the questions may change between attempts. You must complete this quiz within one hour of starting it. After the quiz, you will be able to view your responses only once. Specific Learning Goals 1. Visualize the basic form of spiral galaxies and the position of the solar system and galactic objects in the Milky Way galaxy 2. Explain how the distribution of "metals” (heavy elements) in the galaxy traces its history of star formation. 3. Explain the evidence for "dark matter” and leading theories of what it may be. C Question 1 1pts What causes the blue and red colors to come out in a photograph of a typical nebula, such as shown below? () The ionizing photons from a hot star cause hydrogen gas to glow red and helium to glow blue. The blue color is due to the scattering of light by interstellar dust grains and the red color arises from a hydrogen emission line. ] The blue color comes from gas moving toward us and the red color from gas moving away from us. () Dust grains scatter blue light and let red light pass through, similar to the blue sky and red sunsets in our atmosphere. ) The blue light comes from young, hot stars and the red light from older, cooler stars. Question 2 1pts Astronomers making observations in our Galaxy have been able to rule out a number of suggestions for what the dark matter in the Galaxy might be. Which of the following have we NOT been able to rule out (which suggestion is still “in the running")? ) large quantities of dust (like we find in nebulae) ) black holes @® a new kind of subatomic particle ) Jupiter-mass planets or brown dwarfs ) hydrogen gas that is at low temperatures compared to stars Question 3 1pts Most of the stars in the Milky Way cannot be seen from Earth because of: ) expanding space. ) the finite speed of light ® interstellar gas and dust ) dark matter. The four stars listed below are in different stages of their evolution, and in different locations in the Milky Way. Star Description/location (spectral type) Star (spectral type) Description / location | O-type in disk Massive main-sequence star in the disk ‘ G-type in disk Medium-mass main-sequence star in the disk ‘ | K-type in halo Giant star in the halo ‘ Question 4 1pts Rank these stars from oldest to youngest. O-type in disk Youngest . G-type in disk Middle-aged v K-type in halo Oldest ™ Question 5 Sz Rank these stars from metal-poor to metal-rich. O-type in disk Most metals ¥ G-type in disk Some metals b4 K-type in halo Least metals ¥ Quiz saved at 9:38pm Submi Questions +/ Question 1 + Question 2 +/ Question 3 @ Spacer +/ Question 4 +/ Question 5 Time Running: Hide Time Attempt due: Nov 12 at 11:59pm 1 Hour, 55 Minutes, 22 Seconds
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