Chapter 25 & Chapter 26 Astronomy Test

33 Questions | By Kaysday | Updated: Mar 20, 2022 | Attempts: 168

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Questions and Answers

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