Astro set 5

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Astro set 5
2015-02-23 22:04:13
Astro set
exam 1
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  1. When Copernicus first created his Sun-centered
    model of the universe, it did not lead to substantially better predictions of
    planetary positions than the Ptolemaic model. Why not?
    Copernicus used perfect circles for the orbits of the planets
  2. If you could count stars at a rate of about
    one per second, how long would it take to count all the stars in the Milky Way
    Several thousand years
  3. Suppose we imagine the Sun to be about the
    size of a grapefruit. How far away are the nearest stars (the three stars of
    Alpha Centauri)?
    2,500 miles
  4. What is the ecliptic plane?
    The plane of Earth's orbit around the Sun
  5. Which of the following best describes the
    Milky Way Galaxy?
    a spiral galaxy with a disk about 100,000 light-years in diameter and containing between 100 billion and 1 trillion stars
  6. Which of the following claims can be tested by
    scientific means?
    People born when the Sun is in the constellation of Leo are more financially successful than other people.
  7. Using the ideas discussed in your textbook, in
    what sense are we "star stuff"?
    Nearly every atom from which we are made was once inside of a star.
  8. An astronomical unit is:
    Earth's average distance from the Sun.