Astronomy Exam 2 Part 5

9 Questions | Total Attempts: 110

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Astronomy Quizzes & Trivia

Astronomy exam part 5. Taken from astron. 100 exam 2.


Questions and Answers
  • 1. 
    The cosmic background radiation comes from a time in the evolution of the universe
    • A. 

      A. when protons and neutrons were first formed.

    • B. 

      B. when electrons began to combine with nuclei to form atoms.

    • C. 

      C. when the big bang first began to expand.

    • D. 

      D. the inflationary period.

    • E. 

      E. when gamma rays had enough energy to destroy nuclei.

  • 2. 
    Most of the carbon, nitrogen, oxygen, and other heavy elements on the Earth were originally produced in
    • A. 

      A. the Big Bang.

    • B. 

      B. our Sun.

    • C. 

      C. massive stars that have evolved long ago.

    • D. 

      D. the formation of the Earth.

    • E. 

      E. interstellar gas clouds.

  • 3. 
    Reddening of starlight is caused by
    • A. 

      A. the faint pink glow of hot interstellar gas.

    • B. 

      B. the gravitational pull on photons leaving the star’s surface.

    • C. 

      C. the expansion and cooling of a star’s atmosphere as it grows older.

    • D. 

      D. scattering of blue light by interstellar dust grains.

    • E. 

      E. the expansion of the universe.

  • 4. 
    Astronomers proposed the presence of dark energy because
    • A. 

      A. the expansion of the Universe appears to be accelerating.

    • B. 

      B. the expansion of the Universe appears to be decelerating.

    • C. 

      C. galaxies appear to be brighter than expected.

    • D. 

      D. the Universe appears to become cooler.

    • E. 

      E. the Universe appears to become hotter.

  • 5. 
    The blue-shift exhibited by some nearby external galaxies lends support to the
    • A. 

      A. Big Bang model, because those galaxies are expanding towards us.

    • B. 

      B. Local Group concept, because nearby galaxies interact gravitationally.

    • C. 

      C. evolution theory, because galaxies change color as they evolve.

    • D. 

      D. oscillating Universe theory, because some galaxies are moving together already.

    • E. 

      E. static theory, because the local Universe is apparently not expanding

  • 6. 
    We only observe events that happened in the past because
    • A. 

      A. it takes time to analyze the data.

    • B. 

      B. the speed of light is finite.

    • C. 

      C. the Universe is very old.

    • D. 

      D. our telescopes are not yet large enough.

    • E. 

      E. the light has been red-shifted.

  • 7. 
    The cosmic microwave background radiation provides strong evidence that
    • A. 

      A. star formation has been taking place for billions of years.

    • B. 

      B. the Universe evolved from a hot, dense state.

    • C. 

      C. colliding galaxies release enormous amounts of radiation.

    • D. 

      D. at 3 Kelvin, the early Universe was extremely cool.

    • E. 

      E. the early Universe had more stars.

  • 8. 
    The cosmic microwave background radiation is visible in every direction because
    • A. 

      A. we are at the center of the Universe. .

    • B. 

      B. we are looking back to when the Universe was young in every direction

    • C. 

      C. we are looking back to when the Universe was cool.

    • D. 

      D. it has been scattered by dust to every direction over the age of the Universe.

    • E. 

      E. it originated in a sphere around our own Galaxy.

  • 9. 
    Because the large redshifts of quasars arise from the expansion of the universe, we can conclude that
    • A. 

      A. quasars must be very small.

    • B. 

      B. quasars must be within the Local Group.

    • C. 

      C. quasars must be single stars with extremely large masses.

    • D. 

      D. quasars must be moving toward Earth with a large radial velocity.

    • E. 

      E. quasars must be very luminous.

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