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Section 9.3
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1
Which of the following is a characteristic of dark matter?
A)emits light
B)easily seen in night sky
C)makes up most of the mass of the galaxy
D)forms a spiral galaxy
2
How does the mass of the Milky Way galaxy compare to the mass of the Andromeda galaxy?
A)The galaxies are too massive to measure.
B)Both galaxies have the same mass.
C)The Milky Way galaxy has a greater mass than the Andromeda galaxy.
D)The Andromeda galaxy has a greater mass than the Milky Way galaxy.
3
Why is it so hard to locate dark matter?
A)dark matter’s strong gravitational effects on visible matter
B)dark matter’s weak interactions with visible matter
C)the intensity of light emitted from dark matter
D)the lack of mass of dark matter
4
The "anti-gravity" effect observed with Type Ia supernova is known as…
A)dark energy.
B)dark matter.
C)a spherical halo.
D)a blue ring cluster.
5
Astronomers theorize that dark energy is responsible for…
A)the formation of the Sun.
B)the motions of stars and galaxies.
C)the increased expansion of the universe.
D)changes in the electromagnetic spectrum.





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