Unformatted text preview: 400 years. 3. Which of the following is not required for a celestial body to be classified as a planet? a. It must orbit a star. b. It must have cleared most other objects from its orbital path c. It must be large enough for its own gravity to make it round d. It must have at least one moon rotating around it ( CORRECT ANSWER ) 4. In less than 50 words, explain why the phrase, “It will be light-years before we devise a new method,” does not make sense. A light-year is the distance that light can travel at one year, which is approximately 9.5 trillion kilometers. Light-years are units of distance and not of time. Therefore, one cannot properly measure any time period using light-years. 5. What is the name of the star system that is closest to our own? a. Milky Way b. Alpha Centauri ( CORRECT ANSWER) c. Beta Max d. Alpha Supercluster I...
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- Fall '11