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Chapter 25 & Chapter 26 Astronomy Test

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