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The Galaxies

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 

We can be sure that the Milky Way galaxy we live in is a spiral galaxy rather than an elliptical galaxy because
a.
it has curved arms.
c.
its stars are all about the same age.
b.
it does not show any rotation.
d.
new stars are no longer forming.
 

 2. 

Earth stays in orbit around the Sun because of inertia and
a.
friction.
c.
magnetism.
b.
gravity.
d.
momentum.
 

 3. 

Which is the largest object in the solar system?
a.
Earth
c.
the Sun
b.
Jupiter
d.
the Moon
 

 4. 

If you were to watch the stars all night, they would seem to
a.
stay in exactly the same place in the sky.
b.
move across the sky at night, as the Sun does during the day.
c.
go in circles around the point straight up from where you are.
d.
move across the sky at night, in the opposite direction that the Sun moves during the day.
 

 5. 

According to the big bang theory, the universe originated as a
a.
point where all matter and energy was concentrated.
b.
complex system of galaxies that has since been expanding.
c.
complete, limitless void without any matter or energy.
d.
massive sphere of matter and energy with near-infinite diameter.
 

 6. 

There are several different types of galaxies. The Milky Way, which contains our solar system, is
a.
a spiral galaxy.
c.
a barred spiral galaxy.
b.
an elliptical galaxy.
d.
an irregular galaxy.
 

 7. 

All stars begin their lives as parts of
a.
nebulas.
b.
protostars.
c.
pulsars.
d.
double stars.
 

 8. 

The force that tends to pull together the matter in stars is
a.
gravity
b.
nuclear fusion.
c.
expansion.
d.
nuclear fission.
 

 9. 

Depending on its mass, a star may live from
a.
1 million to 10 million years.
b.
5 million to 100 million years.
c.
10 million to 200 billion years.
d.
10 billion to 500 billion years.
 

 10. 

How are elliptical galaxies and spiral galaxies different?
a.
Elliptical galaxies have almost no gas or dust.
b.
Elliptical galaxies vary more in shape than spiral galaxies.
c.
Spiral galaxies have almost no gas or dust.
d.
Spiral galaxies contain only old stars.
 

 11. 

The Milky Way Galaxy is a
a.
spiral galaxy.
b.
cloud galaxy.
c.
elliptical galaxy.
d.
irregular galaxy.
 

 12. 

Scientists think that our universe is approximately
a.
1 to 5 million years old.
b.
1 to 2 billion years old.
c.
10 to 15 billion years old.
d.
100 to 200 billion years old.
 

 13. 

One piece of evidence that supports the big bang theory is the observation that most galaxies are moving
a.
toward our galaxy.
b.
toward one another.
c.
in random directions.
d.
away from one another.
 

 14. 

The theory that astronomers have developed to describe the formation of the universe is called the
a.
expanding cloud theory.
b.
time warp theory.
c.
galactic expansion theory.
d.
big bang theory.
 

 15. 

The solar system formed from
a.
an expanding galaxy.
b.
a giant cloud of gas and dust.
c.
an enormous explosion.
d.
a black hole.
 

 16. 

You visited an observatory and looked through the telescope. You saw a ball of stars through the telescope. What type of object did you see?
a.
a spiral galaxy
c.
a globular cluster
b.
an open cluster
d.
an irregular galaxy
 

 17. 

In which part of a spiral galaxy do you expect to find nebulas?
a.
the spiral arms
c.
the halo
b.
the central region
d.
all parts of the galaxy
 

 18. 

Which statement about the big bang theory is accurate?
a.
The universe will never end.
b.
New matter is being continuously created in the universe.
c.
The universe is filled with radiation coming from all directions in space.
d.
We can locate the center of the universe.
 

 19. 

Which of the following is the largest?
a.
a nebula
c.
a neutron star
b.
a galaxy
d.
a globular cluster
 

 20. 

According to the big bang theory, the universe is about
a.
470 billion years old.
c.
4.7 billion years old.
b.
500 billion years old.
d.
15 billion years old.
 
 
Examine the illustrations of galaxies below, and answer the questions that follow.
galaxiequiz_files/i0220000.jpg
 

 21. 

Illustration A is a(n)
a.
spiral galaxy.
c.
irregular galaxy.
b.
elliptical galaxy
d.
quasar.
 

 22. 

Illustration B is a(n)
a.
spiral galaxy.
c.
irregular galaxy.
b.
elliptical galaxy
d.
quasar.
 

 23. 

Illustration C is a(n)
a.
spiral galaxy.
c.
irregular galaxy.
b.
elliptical galaxy.
d.
quasar.
 

 24. 

In space, ____ are giant clouds of gas and dust.
a.
nebulas (or nebulae)
c.
open clusters
b.
globular clusters
d.
quasars
 



 
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