Exam1.A.answersASTR1020 - Last Name First Name Student ID...

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1 ___________________________________________ ASTR 1020, Spring 2008 Last Name First Name Professor Jack Burns Exam #1 ___________________________________________ February 20, 2008 Student ID Number INSTRUCTIONS: Closed books, one page (2 sides) of notes allowed, calculators may be used, strictly individual effort . WRITE your name and student ID number on this front page 1 and on the short answer page at the end of the exam. ENCODE your student number and test form version (A or B, circled above) also on the scan sheet. Do NOT enter anything in box “exam number”. The exam consists of 20 multiple choice questions worth 3 points each, 5 true-false questions worth 2 points each, and 3 short answer questions worth 10 points each. Please allocate your time accordingly among these parts of the exam. Multiple Choice (3 points each): 1. Which of the following is smallest? a. Size of a typical planet b. 1 light-hour c. 1 astronomical unit (AU) d. Size of a typical star e. Diameter of the Milky Way galaxy 2. Suppose we imagine the Sun to be about the size of a grapefruit. About how big an area would the orbit of Pluto cover? 3. About how long would it take to count all the stars in the Milky Way Galaxy at a rate of one star per second? (A day contains 86,400 seconds and a year contains about 32 million seconds.) a. Several days. b. Several weeks. c. Several years. d. Several thousand years. e. Hundreds of thousands of years. 4. On a cosmic calendar, in which the history of the Universe is compressed into one year, how long is the average human life span?
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