The Realm Of The Galaxies

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Question 1
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We can determine the 3-dimensional shape of any individual elliptical galaxy by photographing it.

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Question 2
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The Hubble tuning fork diagram (figure below)represents an evolutionary diagram of galaxies from elliptical to spiral.
image

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Question 3
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Although elliptical and irregular galaxies have been observed in both dwarf and giant varieties,we find only giant spiral galaxies.

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Question 4
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The 3-dimensional shape of an elliptical galaxy depends on the average velocity of its stars along each of the three axes.

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Question 5
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Star formation in spiral galaxies happens only in the spiral arms.

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Question 6
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Any asymmetry in the gravity field of a spiral galaxy can induce spiral structure.

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Question 7
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We know that spiral galaxies contain dark matter because the gas in the disk rotates with a velocity that decreases in a way that is similar to our Solar System.

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Question 8
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Dark matter consists of material that emits radiation at wavelengths other than visible light.

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Question 9
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Dark matter is distributed inside galaxies in exactly the same way as luminous matter,although the total mass of dark matter is much larger than that of luminous matter.

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Question 10
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Galaxies that are classified as quasars were much more numerous in the past.

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Question 11
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The type of AGN we see depends mostly on the angle at which we view the galaxy.

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Question 12
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Astronomers believe that all giant galaxies probably contain supermassive black holes.

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Question 13
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Seyfert galaxies are unique because they have large lobes of radio emission that extend well beyond the visible part of the galaxy.

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Question 14
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We know AGN are about the size of our Solar System because of imaging done with the Hubble Space Telescope.

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Question 15
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We classify galaxies by:

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A
their true shapes
B
how they appear in the sky
C
the amount of gas and dust in them
D
whether they are near or far from us
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Question 16
Multiple Choice

The image below is of a spiral galaxy. image In spiral galaxies,the size of the central bulge is correlated with the:

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A
tightness of the spiral arms
B
luminosity of the galaxy
C
age of the galaxy
D
thickness of the disk
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Question 17
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Elliptical galaxies appear red because:

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A
they are moving away from us
B
they contain mostly ionized hydrogen gas
C
they contain mostly old stars
D
they contain lots of dust
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Question 18
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Approximately __________ of spiral galaxies are barred. image

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A
10 percent
B
25 percent
C
50 percent
D
75 percent
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Question 19
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The 3-dimensional shape of __________ is set by the average velocities of the stars along each of the three axes.

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A
spiral galaxies
B
elliptical galaxies
C
elliptical galaxies and spiral bulges
D
quasars
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Question 20
Multiple Choice

The disks of spiral galaxies appear blue because:

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A
spiral galaxies are moving toward us
B
spiral galaxies contain mostly hot blue stars
C
spiral galaxies are still undergoing star formation
D
spiral galaxies contain more metals that,when ionized,emit blue light
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