Chapter 25 & Chapter 26 Astronomy Test

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