Chapter 25 & Chapter 26 Astronomy Test

33 Questions  I  By Kaysday
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1.  In our best current theory, how long ago did the first quasars form?
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B.
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2.  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 ______
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B.
C.
3.  If the density of the universe is less than critical we will experience a ________.
4.  ________ Galaxies may bridge the gap between spiral galaxies and quasars.
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B.
C.
5.  While yet unseen, some gravitational evidence suggests the existence of dark gallaxies
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B.
6.  According to their H-R diagrams turn off points, how old are the oldest globular clusters?
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B.
C.
7.  In their most energetic phase, a quasar can probably only last
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B.
C.
8.  What is the effect on individual stars when galaxies collide?
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B.
9.  The central regions of active galaxies are fed by ____
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B.
C.
10.  What does the hubble law imply about the history of the universe?
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B.
11.  A billion solar mass black hole has a radius of only _____ (in A.U)
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B.
C.
12.  About how many galaxies are estimated to be in the observable universe?
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B.
C.
13.  What is the meaning of isotropic?
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B.
14.  Which type of galaxy is rare in the center of clusters?
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B.
C.
15.  A galaxy is at a distance of one billion light years. What is true about the way we see that galaxy?
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B.
C.
16.  Dark matter is ____ %  of the matter in the universe
17.  The satellite most responsible for studying the microwave universe and the nature of the cosmic background radiation
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B.
C.
18.  The last quasar probably died out a billion years ago, for none lie within a billion light years of us
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B.
19.  Collisions between galaxies result in
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C.
20.  While a variety of factors can reduce red shifts in the spectrum the red shift associated with the expansion of the universe is called
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B.
C.
21.  ______ is the concept that all large samples of the universe are alike in appearance everywhere in the universe.
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B.
22.  Collisions between galaxies have a larger effect on the individual stars
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B.
23.  The Black hole at the center of active galaxie or quasar requires ______ to radiate massive amounts of energy
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B.
C.
24.  What is the meaning of a "closed universe"?
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B.
25.  We now believe the majority of mass for most galaxies lies in their dark halos
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B.
26.  In the critical universe now proposed, the ration of matter / energy is about
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B.
27.  Why are super-massive galaxies often found at the cores of rich galaxy clusters?
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B.
C.
28.  Collisions between galaxies are rare, just as in case with stars.
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B.
29.  Quasars end in a massive explosion as a gamma ray burst.
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B.
30.  The most massive galaxies have _____ of times more stars than the milky way.
31.  The best method of determining the mass of nearby spiral galaxies is by:
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B.
C.
32.  What determines whether colliding gallaxies will stick and merge or simply pass through eachother?
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C.
33.  Why is it not correct to think of everything moving away from a central point in the universe?
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B.
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