Exam 1 Review Solutions

Exam 1 Review Solutions - Review exam 1 Solutions. CHAPTER...

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Review exam 1 Solutions. CHAPTER 1 ANSWERS OF REVIEW QUESTIONS: 2. Earth rotates toward the east, from left to right in Figure 1-4 (note that you can identify the Baja peninsula and Southern California). This is because earth rotates counter clockwise from the point of view of looking down at the north pole. As Earth turns from left to right in the image, the land will be carried from daylight into darkness; thus the boundary is the sunset line that separates afternoon from evening and night. 3. Our solar system is the collection of gas, dust, and larger bodies gravitationally bound to the sun. This includes the sun, all planets and their satellites, asteroids, comets, and the gas and dust found in interplanetary space. The primary constituents of the solar system are the sun, planets and comets. Our galaxy on the other hand is primarily composed of stars, and clouds of gas and dust known as nebulae. The galaxy is held together by the mutual gravitational attraction of the gas, dust, and stars within it. The universe is the collection of all matter. Anything that has mass or energy is part of the universe, whether we can observe it our not. 6. Seeing planets around other star systems is very difficult for three reasons. First, they will appear as point sources. Planets are smaller in radius than the stars they orbit, but at the same distance. Hence their angular diameter would be even smaller. Second, the planets will also be much fainter than the stars they orbit. The light received from a planet is light from the star that reflects off the planet's surface. The planet's surface probably isn't perfectly reflecting and is smaller in size than the star; therefore, the light from the planet will be much fainter than that from the star. Finally, we are trying to look for this very faint light from the planet right next to the much brighter light from the star, making the planet even more difficult to notice. 8. The Milky Way is a faint grayish band of light that forms a circular path across the night sky. It is something that can be easily observed from Earth. The Milky Way galaxy is a collection of about 10 11 stars that contains a well-defined disk with a spiral nature and an extended halo. All of the stars visible to the naked eye are part of the Milky Way Galaxy, but they are not necessarily part of the Milky Way. Note there are three objects visible to the naked eye that aren’t part of the Milky Way galaxy, these are the Andromeda Galaxy, the Large Magellanic Cloud, and the Small Magellanic Cloud. 10. The object pictured is a galaxy. All galaxies contain stars and planets. This galaxy also shows well defined spiral arms. Galaxy clusters are groups of galaxies that are bound together by their mutual gravitation, and filaments are large strings of galaxy clusters. So the galaxy pictured contains stars, planets, and spiral arms, and could be contained within a galaxy cluster and filament.
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ANSWERS TO PROBLEMS 2. 3,475 km 9. 1.9×10 22 m Multiple Choice
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This note was uploaded on 04/02/2008 for the course ASTRO 103 taught by Professor Tweedale during the Spring '08 term at Wisconsin Milwaukee.

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Exam 1 Review Solutions - Review exam 1 Solutions. CHAPTER...

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