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xe a lar olrhs ×( TaBor B xD https://x Printabl ×y D astro.ax My Co. ard.com/bbcswebdav/pid-5927099-dt-content-rid-23065679 1/courses/2017FA-ASTR-110-2263/astro-qs6.pd See sections 11-12 to 11-15 in Chapter 11 of your textbook. 1. What happens to Cepheid variable stars when they brighten and fade repeatedly? Possible Choices: They gradually turn inside out. They expand and shrink. They bun types of fuel they did not bum before. They precess more strongly (wobbling). 2. How fast do the most luminous (brightest) Cepheid stars pulsate compared to the dimmer ones? (A) More quickly with short periods (B) More slowly with long periods 3. What is the name for tear-drop shaped regions around a pair of binary stars that indicate which areas are controlled by the gravity of each star? See sections 12-1 to 12-10. Answer these questions: 4. When a star like our Sun finally dies, its core will shrivel up to become a tiny "white dwarf," while the outer layers of the star will eject into space, producing a nebula. What is the name for this type of nebula. Do not simply mention an example of one. 5. The Chandrasekhar Limit is a limit on the maximum mass that a certain kind of dead star is allowed to have. What is this type of dead star? 6, "Cosmic rays" are partieles out in space traveling at 90% of the speed of light hit the Earth's atmosphere often. What type of events, far away, is thought to send these particles flying toward us? 7. A neutron star is a highly compressed ball of neutrons, about 10-15 miles wide, that is left after certain supernova explosions. If it is spinning fast and flashing a beam periodically in our direction, then what additional one-word name can we give it? See sections 12-11 to 12-18. Answer these questions: 8. What is the limit around a black hole, beyond which no light or infomation or anything else can escape? 9. Consider a black hole that is not currently feeding. In the "ergoregions" area just outside the event horizon of a spinning black hole, what does the black hole drag around itself? See sections 13-1 to 13-7 in Chapter 13. Answer these questions: 10. In 1920, a great debate was held between Harlow Shapley and Heber Curtis. Which of these two astronomers falsely believed "spiral nebulac" to be small objects inside the Milky Way Galaxy?Explanation / Answer
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