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Astronomy 1400 Review for Test 1

Astronomy 1400 Review for Test 1 - Astronomy 1400 Review...

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Astronomy 1400 Review for Test 1 Please make sure you carefully read each chapter study the “ summary of key concepts ” at the end of each chapter. Know the material we have covered in class . The following is a review of the material discussed in class. It also serves as sample test questions. All questions can be answered in a few words or sentences. All of these questions were answered in class or are in the text. If you need help with a particular question I will be happy to help provided you first make a significant EFFORT to answer the question on your own! Please bring an orange scantron and #2 pencil to the test: it will be 50 questions multiple choice. You will not need a calculator. Chapter 1 1. What is our cosmic address in order of increasing size? Where is the Sun in the Milky Way? A little over halfway from the galactic center to the edge of the galactic disk 2. How many galaxies are in our local group? Are the galaxies on our local group expanding away from each other? 40 galaxies The Galaxies are moving randomly 3. About how many stars are in our galaxy? 100 billion stars in the Milky Way 4. How are heavier elements (than is, elements heavier than Lithium) produced? In what sense are we then made of “star stuff”? Following this line of thought, why do scientists think the Universe was lifeless for at least about 2 billion years? The heavier elements are manufactured when starts either supernova or by the nuclear fission that makes them shine What is composed in our bodies is here because stars died before our sun was born 5. What do we mean by the “observable Universe”? Can we see the actual edge of our universe and consequently know exactly how big it is? The amount of universe that we can see, any more would be looking at the universe before it existed We can’t see the actual edge of the universe though, the light hasn’t had time to reach our planet yet 6. About how old is the universe?
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14 billion years old 7. Define galaxy, and solar system. Galaxy- A great island of stars in space, containing from a few hundred million to a trillion or more starts, all held together by gravity and orbiting a common center Solar System- Our solar system consists of the Sun and all the material that orbits it, including the planets. The term solar system technically refers only to our own star system. 8. If we scale the history of the universe into one year, when did the Milky Way form? Earth? When did the dinosaurs become extinct? When did human civilization occur? Milky way forms in February, Earth formed on September 3 rd , Dinosaurs extinct December 30 th , Human civilization occurred 25 seconds ago 9. Define light year, astronomical unit, and parsec. Which is largest? Smallest?
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Astronomy 1400 Review for Test 1 - Astronomy 1400 Review...

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