Astronomy Exam 2 Part 5

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  • 1/9 Questions

    We only observe events that happened in the past because

    • A. it takes time to analyze the data.
    • B. the speed of light is finite.
    • C. the Universe is very old.
    • D. our telescopes are not yet large enough.
    • E. the light has been red-shifted.
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About This Quiz

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

Astronomy Quizzes & Trivia

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  • 2. 

    Astronomers proposed the presence of dark energy because

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

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

    • C. galaxies appear to be brighter than expected.

    • D. the Universe appears to become cooler.

    • E. the Universe appears to become hotter.

    Correct Answer
    A. A. the expansion of the Universe appears to be accelerating.
  • 3. 

    The cosmic microwave background radiation provides strong evidence that

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

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

    • C. colliding galaxies release enormous amounts of radiation.

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

    • E. the early Universe had more stars.

    Correct Answer
    A. B. the Universe evolved from a hot, dense state.
  • 4. 

    Because the large redshifts of quasars arise from the expansion of the universe, we can conclude that

    • A. quasars must be very small.

    • B. quasars must be within the Local Group.

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

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

    • E. quasars must be very luminous.

    Correct Answer
    A. E. quasars must be very luminous.
  • 5. 

    The cosmic microwave background radiation is visible in every direction because

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

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

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

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

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

    Correct Answer
    A. B. we are looking back to when the Universe was young in every direction
  • 6. 

    The cosmic background radiation comes from a time in the evolution of the universe

    • A. when protons and neutrons were first formed.

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

    • C. when the big bang first began to expand.

    • D. the inflationary period.

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

    Correct Answer
    A. B. when electrons began to combine with nuclei to form atoms.
  • 7. 

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

    • A. the Big Bang.

    • B. our Sun.

    • C. massive stars that have evolved long ago.

    • D. the formation of the Earth.

    • E. interstellar gas clouds.

    Correct Answer
    A. C. massive stars that have evolved long ago.
  • 8. 

    Reddening of starlight is caused by

    • A. the faint pink glow of hot interstellar gas.

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

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

    • D. scattering of blue light by interstellar dust grains.

    • E. the expansion of the universe.

    Correct Answer
    A. D. scattering of blue light by interstellar dust grains.
  • 9. 

    The blue-shift exhibited by some nearby external galaxies lends support to the

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

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

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

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

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

    Correct Answer
    A. B. Local Group concept, because nearby galaxies interact gravitationally.

Quiz Review Timeline (Updated): Mar 20, 2022 +

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  • Current Version
  • Mar 20, 2022
    Quiz Edited by
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  • Apr 29, 2010
    Quiz Created by
    Mllanos87
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