ISC Chapter 12

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ISC Chapter 12
2011-11-21 23:14:17
ISC Chapter 12

ISC Chapter 12
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  1. Distance in outer space is measured in terms of
    C. light-years
  2. Ancient civilizations observed motion of celestial objects at least in part, to enable them to
    D. tell time
  3. An astronaut on the Moon would observe stars to
    A. not twinkle
  4. Star-forming nebulae initially rely upon ________ to create a protostar
    B. shock waves
  5. The interior of an average star is proposed to contain all of the following EXCEPT
    A. conduction zone
  6. All of the following account for the difference in brightness of stars EXCEPT
    B. location in sky
  7. Starlight provides astronomers with all of the following information EXCEPT
    B. mass
  8. Red giant stars are
    A. bright, low temperature giants
  9. Stars that are faint, very dense, white hot and close to the end of their lifetimes are
    C. white dwarf stars
  10. Which of these elements are formed in supernova explosions of dying stars?
    D. nickel
  11. The greater the distance to a galaxy, the greater a red shift in its spectral lines. This is known as
    C. Hubble's Law
  12. Evidence that points to the existence of black holes was produced by the
    B. Hubble Space Telescope
  13. The name of our galaxy is the
    C. Milky Way
  14. The Milky Way is defined by all of the following structures EXCEPT
    C. clusters
  15. The Milky Way
    B. is filled with gas, dust, and molecules.
  16. The Milky Way's gravitational attraction is the reason why we have
    C. satellite galaxies
  17. The scientist who developed a scheme to classify galaxies was
    A. Hubble
  18. The Big Bang Theory is NOT supported by
    C. absence of cosmic background radiation
  19. What is the stumbling block to finding extra terrestrial life?
    C. distance and time
  20. As viewed from the Earth, stars are ________ sources of light
    B. point
  21. Density differences in the atmosphere result in_________ of star light
    C. refraction
  22. Planets ________ light
    A. reflect
  23. Which force is responsible for the collapse of a nebula into a protostar?
    C. gravitational
  24. Our sun is
    C. an average star powered by fusion reactions
  25. Interstellar clouds of hydrogen gas with very little gravitational attraction between the hydrogen particles are called
    B. nebulae
  26. Atoms in the average star absorb and reemit gammarays and x-rays in its
    B. radiation zone
  27. The brightness of a star at a defined standard distance is
    C. absolute magnitude
  28. The brightest star in the night sky is called
    B. Sirius
  29. The color of a hot star is
    A. blue-white
  30. The color of a star is related to its
    D. surface temperature
  31. The temperature-luminosity graph used to classify stars was developed by:
    D. Hertzsprung and Russell
  32. The narrow band of stars that moves from the top left to the bottom right of the Hertzsprung-Russell diagram is the
    B. main sequence
  33. The period-brightness relationship of a Cepheid variable star allows astronomers to measure stellar
    A. distance
  34. Our sun is considered _________ based on the Hertzsprung-Russell classification of stars
    A. main sequence
  35. The lifetime of a star depends on its
    B. mass
  36. The stages in the life of a star are
    C. protostar, main sequence, red giant, white dwarf
  37. Less massive stars grow old and expand and contract which results in its outer layer being blown off into space. The outer layer forms a
    D. planetary nebula
  38. Fusion reaction stages continue in massive stars until the element ______ is formed
    C. iron