Chapter 25 & Chapter 26 Astronomy Test
Questions and Answers
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1.A billion solar mass black hole has a radius of only _____ (in A.U)
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A.
About 10 A.U
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B.
About 15 A.U.
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C.
About 20 A.U
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A.
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2.What determines whether colliding gallaxies will stick and merge or simply pass through eachother?
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A.
Time
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B.
Crowding
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C.
Space
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A.
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3.The Black hole at the center of active galaxie or quasar requires ______ to radiate massive amounts of energy
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A.
Matter
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B.
Energy
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C.
Fuel
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A.
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4.The central regions of active galaxies are fed by ____
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A.
Fuel
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B.
Energy
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C.
Matter
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A.
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5.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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A.
We see it 5 billion years away
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B.
We see it one billion years away
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C.
We see it ten billion years away
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A.
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6.Dark matter is ____ % of the matter in the universe
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7.The best method of determining the mass of nearby spiral galaxies is by:
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A.
Determining its distance
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B.
Determining its rotation curves
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C.
Determining its amount of matter
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A.
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8.What is the effect on individual stars when galaxies collide?
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A.
No effect
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B.
The combined
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A.
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9.Collisions between galaxies result in
-
A.
Rearranging the stellar contents
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B.
Stars merging
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C.
Rearranging the interstellar conents
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A.
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10.The most massive galaxies have _____ of times more stars than the milky way.
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11.Which type of galaxy is rare in the center of clusters?
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A.
Spiral
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B.
Binary
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C.
Ordinary
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A.
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12.Why are super-massive galaxies often found at the cores of rich galaxy clusters?
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A.
Cannibalism
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B.
Due to the amount of energy
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C.
Because of gravity
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A.
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13.In their most energetic phase, a quasar can probably only last
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A.
Two years
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B.
Two million years
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C.
Two billion years
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A.
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14.________ Galaxies may bridge the gap between spiral galaxies and quasars.
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A.
Elliptical
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B.
Binary
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C.
Seyfret
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A.
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15.We now believe the majority of mass for most galaxies lies in their dark halos
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A.
True
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B.
False
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A.
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16.While yet unseen, some gravitational evidence suggests the existence of dark gallaxies
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A.
True
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B.
False
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A.
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17.Collisions between galaxies have a larger effect on the individual stars
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A.
True
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B.
False
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A.
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18.Collisions between galaxies are rare, just as in case with stars.
-
A.
True
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B.
False
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A.
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19.Quasars end in a massive explosion as a gamma ray burst.
-
A.
True
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B.
False
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A.
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20.The last quasar probably died out a billion years ago, for none lie within a billion light years of us
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A.
True
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B.
False
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A.
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21.What does the hubble law imply about the history of the universe?
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A.
It is untrue
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B.
It has always been expanding
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A.
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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 ______
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A.
Date
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B.
Age
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C.
Time
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A.
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23.According to their H-R diagrams turn off points, how old are the oldest globular clusters?
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A.
3-4 billion years
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B.
4-5 billion years
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C.
5-6 billion years
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A.
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24.In our best current theory, how long ago did the first quasars form?
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A.
11 billion years ago
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B.
13 billion years ago
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C.
15 billion years ago
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A.
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25.About how many galaxies are estimated to be in the observable universe?
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A.
30 billion
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B.
35 billion
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C.
40 billion
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A.
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26.Why is it not correct to think of everything moving away from a central point in the universe?
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A.
Because its impossible
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B.
Because there is no center
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A.
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27.In the critical universe now proposed, the ration of matter / energy is about
-
A.
73/27
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B.
27/73
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A.
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28.The satellite most responsible for studying the microwave universe and the nature of the cosmic background radiation
-
A.
CBE
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B.
CCE
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C.
CDE
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A.
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29.What is the meaning of isotropic?
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A.
The universe is all different
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B.
The universe is the same in all directions
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A.
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30.______ is the concept that all large samples of the universe are alike in appearance everywhere in the universe.
-
A.
Homogeneous
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B.
Isotropic
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A.
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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
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B.
Cosmological
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C.
Universal
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A.
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32.If the density of the universe is less than critical we will experience a ________.
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33.What is the meaning of a "closed universe"?
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A.
Space is bent in so much it closes itself
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B.
Space has closed off
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A.
