Universe Review. 3. The light emitted from a star is studied by astronomers to determine which of the following properties?

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1 Name: Universe Review Period: 1. Which type of telescope uses mirrors to focus visible light? A. reflecting telescope B. radio telescope C. infrared telescope D. refracting telescope 2. Which type of telescope uses only lenses to focus visible light? A. reflecting telescope B. radio telescope C. infrared telescope D. refracting telescope 3. The light emitted from a star is studied by astronomers to determine which of the following properties? A chemical composition B temperature C star classification D all of the above 4. Which of these correctly compares the masses of different objects in the universe? F A moon has less mass than a star and more mass than the planet it orbits. G A planet has less mass than a galaxy and more mass than the star it obits. H A galaxy has less mass than a moon and more mass than a planet. J A star has less mass than a galaxy and more mass than a planet. 5. Sunspots appear and disappear in a cycle that lasts approximately years. A. 5 B. 11 C. 22 D The picture shows sand used to make a model of the Milky Way galaxy. Which of the following best represents where the Sun should be located on the model? F Q G R H S J T

2 7. Which stars have a temperature of between 7,500 K and 20,000 K and a luminosity of 100 times less than the Sun? (Use above HR diagram to help you) A White Dwarfs B Super Giants C Main Sequence D Giants Star Luminosity (Sun 1) Rigel 20,000 x Brighter than the Sun 10 Lacerta 1,000,000 x Brighter than the Sun Betelgeuse 14,000 x Brighter than the Sun 8. The table above shows the luminosity of 3 stars in comparison to the Sun s luminosity. Which of the following best describes why the Sun appears brighter than other stars with higher luminosities for an observer on the Earth? F The Sun has a higher temperature than most stars in the Universe. G The Sun is closer to the Earth than other stars in the Universe H The Sun is large than most. J The Sun is a large red giant star in the Universe 9. The bright surface of the sun is known as the. A. corona B. photosphere C. Core D. Mesosphere

3 10. The sun is composed mostly of which element? A. iron B. carbon C. hydrogen D. oxygen 11. The reaction taking place in the sun s core. A. combines oxygen with hydrogen B. converts hydrogen to helium C. splits atoms of uranium D. burns carbon Use chart below for question 12. Star Classification Distance (light-years) Sun G Alpha Centauri A G2V 4.3 Wolf 359 M6.0V 7.8 Beta Procyon White dwarf 11.4 Van Maanen s star DZ The light observed in 2013 by astronomers from Van Maanen s star was emitted most likely in F 2013 G 2012 H 1999 J None of the above 13. Which of the following best explains why light-years are used by astronomers to measure the diameter of the galaxies shown in the table above? A Distances in space take many years to measure when larger than a galaxy. B Other measurements are too small to accurately and easily measure distance in space. C Tools used to measure distance on Earth cannot be used in space. D Astronomers use telescopes which can only measure light. 14. What do the big bang theory and the steady state theory attempt to describe? A the origin of the universe B the appearance of black holes C supernovas D the life cycle of stars

4 15. The brightest, most distant objects we can see may be galaxies in the process of forming. These objects are known as. A comets B supernovas C black holes D quasars 16. A is a large group of stars, dust, and gas that are held together by gravity. A solar system B planet C galaxy D asteroid belt 17. Which of the following describes a star? A A sphere of dust and gases that contain many elements and produces light from fusion and fission reactions B A collection of gases from several nebulae hot enough to cause a nuclear reaction C A sphere of matter with a density and a temperature great enough to cause a nuclear reaction at its center D A collection of hot gases that forms a sphere but produces no light Important Vocabulary to Know binary system light-year dwarf giants protostar supernova nebula spectrograph solar flares sunspots corona solar wind thermonuclear fusion spiral elliptical irregular superclusters Milky Way Large Magellanic Cloud Small Magellanic Cloud Ursa Major Ursa Minor Oort Cloud Kuiper Belt Pleiades Cluster Hercules Cluster

5 Item # Answer 1 A 2 D 3 D 4 J 5 B 6 H 7 A 8 G 9 B 10 C 11 B 12 H 13 B 14 A 15 D 16 C 17 C