Chapter 25 & Chapter 26 Astronomy Test

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Astronomy Quizzes & Trivia
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  • 1. 
    A billion solar mass black hole has a radius of only _____ (in A.U)
    • A. 

      About 10 A.U

    • B. 

      About 15 A.U.

    • C. 

      About 20 A.U


  • 2. 
    What determines whether colliding gallaxies will stick and merge or simply pass through eachother?
    • A. 

      Time

    • B. 

      Crowding

    • C. 

      Space


  • 3. 
    The Black hole at the center of active galaxie or quasar requires ______ to radiate massive amounts of energy
    • A. 

      Matter

    • B. 

      Energy

    • C. 

      Fuel


  • 4. 
    The central regions of active galaxies are fed by ____
    • A. 

      Fuel

    • B. 

      Energy

    • C. 

      Matter


  • 5. 
    A galaxy is at a distance of one billion light years. What is true about the way we see that galaxy?
    • A. 

      We see it 5 billion years away

    • B. 

      We see it one billion years away

    • C. 

      We see it ten billion years away


  • 6. 
    Dark matter is ____ %  of the matter in the universe

  • 7. 
    The best method of determining the mass of nearby spiral galaxies is by:
    • A. 

      Determining its distance

    • B. 

      Determining its rotation curves

    • C. 

      Determining its amount of matter


  • 8. 
    What is the effect on individual stars when galaxies collide?
    • A. 

      No effect

    • B. 

      The combined


  • 9. 
    Collisions between galaxies result in
    • A. 

      Rearranging the stellar contents

    • B. 

      Stars merging

    • C. 

      Rearranging the interstellar conents


  • 10. 
    The most massive galaxies have _____ of times more stars than the milky way.

  • 11. 
    Which type of galaxy is rare in the center of clusters?
    • A. 

      Spiral

    • B. 

      Binary

    • C. 

      Ordinary


  • 12. 
    Why are super-massive galaxies often found at the cores of rich galaxy clusters?
    • A. 

      Cannibalism

    • B. 

      Due to the amount of energy

    • C. 

      Because of gravity


  • 13. 
    In their most energetic phase, a quasar can probably only last
    • A. 

      Two years

    • B. 

      Two million years

    • C. 

      Two billion years


  • 14. 
    ________ Galaxies may bridge the gap between spiral galaxies and quasars.
    • A. 

      Elliptical

    • B. 

      Binary

    • C. 

      Seyfret


  • 15. 
    We now believe the majority of mass for most galaxies lies in their dark halos
    • A. 

      True

    • B. 

      False


  • 16. 
    While yet unseen, some gravitational evidence suggests the existence of dark gallaxies
    • A. 

      True

    • B. 

      False


  • 17. 
    Collisions between galaxies have a larger effect on the individual stars
    • A. 

      True

    • B. 

      False


  • 18. 
    Collisions between galaxies are rare, just as in case with stars.
    • A. 

      True

    • B. 

      False


  • 19. 
    Quasars end in a massive explosion as a gamma ray burst.
    • A. 

      True

    • B. 

      False


  • 20. 
    The last quasar probably died out a billion years ago, for none lie within a billion light years of us
    • A. 

      True

    • B. 

      False


  • 21. 
    What does the hubble law imply about the history of the universe?
    • A. 

      It is untrue

    • B. 

      It has always been expanding


  • 22. 
    Recent work with Type I supernovae at great distances suggests the universe may in face be accelerating its expansion, a discovery attributed the newly found ______
    • A. 

      Date

    • B. 

      Age

    • C. 

      Time


  • 23. 
    According to their H-R diagrams turn off points, how old are the oldest globular clusters?
    • A. 

      3-4 billion years

    • B. 

      4-5 billion years

    • C. 

      5-6 billion years


  • 24. 
    In our best current theory, how long ago did the first quasars form?
    • A. 

      11 billion years ago

    • B. 

      13 billion years ago

    • C. 

      15 billion years ago


  • 25. 
    About how many galaxies are estimated to be in the observable universe?
    • A. 

      30 billion

    • B. 

      35 billion

    • C. 

      40 billion


  • 26. 
    Why is it not correct to think of everything moving away from a central point in the universe?
    • A. 

      Because its impossible

    • B. 

      Because there is no center


  • 27. 
    In the critical universe now proposed, the ration of matter / energy is about
    • A. 

      73/27

    • B. 

      27/73


  • 28. 
    The satellite most responsible for studying the microwave universe and the nature of the cosmic background radiation
    • A. 

      CBE

    • B. 

      CCE

    • C. 

      CDE


  • 29. 
    What is the meaning of isotropic?
    • A. 

      The universe is all different

    • B. 

      The universe is the same in all directions


  • 30. 
    ______ is the concept that all large samples of the universe are alike in appearance everywhere in the universe.
    • A. 

      Homogeneous

    • B. 

      Isotropic


  • 31. 
    While a variety of factors can reduce red shifts in the spectrum the red shift associated with the expansion of the universe is called
    • A. 

      Doppler

    • B. 

      Cosmological

    • C. 

      Universal


  • 32. 
    If the density of the universe is less than critical we will experience a ________.

  • 33. 
    What is the meaning of a "closed universe"?
    • A. 

      Space is bent in so much it closes itself

    • B. 

      Space has closed off


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