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Wednesday, December 14, 2011

Astronomy

1.

QM12 - Q1

It is now believed the majority of mass for most galaxies lies in their dark halos.
Student ResponseValueCorrect Answer
True100%True
Score:5/5

2.

QM12 - Q2

For nearby spirals, their rotation curves help measure both light and dark matter.
Student ResponseValueCorrect Answer
True100%True
Score:5/5

3.

QM12 - Q3

While yet unseen, some gravitational evidence suggests the existence of dark galaxies.
Student ResponseValueCorrect Answer
True100%True
Score:5/5

4.

QM12 - Q4

The last quasar probably died out a billion years ago, for none lie within a billion light years of us.
Student ResponseValueCorrect Answer
True100%True
Score:5/5

5.

QM12 - Q5

Vast majority of the known volume of the universe lies in the voids.
Student ResponseValueCorrect Answer
True100%True
Score:5/5

6.

QM12 - Q6

Rotation curves for spiral galaxies show
Student ResponseValueCorrect AnswerFeedback
they are slowing down.
rotation speed drops off further from the nucleus.
Student Response most have dark halos.100%Student Response  
most of the mass lies in the nucleus.
no relation to mass.
Score:5/5

7.

QM12 - Q7

As we look at larger and larger scales in the universe, we find
Student ResponseValueCorrect AnswerFeedback
smaller and smaller masses.
almost exclusively visible matter.
a larger and larger percentage of the matter is visible.
Student Response a larger and larger percentage of the matter is dark.100%Student Response  
an equal amount of visible and dark matter.
Score:5/5

8.

QM12 - Q8

Collisions between galaxies is thought to
Student ResponseValueCorrect AnswerFeedback
have stopped about 5 billion years ago.
be commonplace.Student Response  
have never occurred.
be extremely rare.
Student Response have only occurred between 10 and 15 billion years ago.0%
Score:0/5

9.

QM12 - Q9

Compared to the Milky Way, how many stars are contained in the most massive galaxies?
Student ResponseValueCorrect AnswerFeedback
two-three times
Student Response tens of times100%Student Response  
hundreds of times
thousands of times
millions of times
Score:5/5

10.

QM12 - Q10

Due to the galaxy density and collisions, ________ are rare in the centers of clusters.
Student ResponseValueCorrect AnswerFeedback
irregulars
quasars
Student Response spirals100%Student Response  
black holes
blazars
Score:5/5

11.

QM12 - Q11

Galaxies in clusters are much more likely to become "active" than ones alone in space.
Student ResponseValueCorrect Answer
True100%True
Score:5/5

12.

QM12 - Q12

The Lyman-alpha "forest" are absorption lines in a quasar spectrum created by all of the gases along the billions of light years its energy has traversed.
Student ResponseValueCorrect Answer
True100%True
Score:5/5

13.

QM12 - Q13

Gravity lensing lets us map the distribution of both visible and dark matter.
Student ResponseValueCorrect Answer
True100%True
Score:5/5

14.

QM12 - Q14

Which of these is NOT considered a fine example of galactic collisions?
Student ResponseValueCorrect AnswerFeedback
the Cartwheel Galaxy
the Antennae Galaxies
the Whirlpool Galaxy
Student Response M-31 in Andromeda100%Student Response  
M -87 in Virgo
Score:5/5

15.

QM12 - Q15

Astronomer's believe that a spiral galaxy may form
Student ResponseValueCorrect AnswerFeedback
from a collision between a small and large galaxy.Student Response  
due to a quasar shutting down.
Student Response from the sudden contraction of an elliptical galaxy.0%
from the collision of two giant elliptical galaxies.
from the explosion of a dwarf irregular galaxy.
Score:0/5

16.

QM12 - Q16

According to the HST data, very distant (and early) galaxies tend to be
Student ResponseValueCorrect AnswerFeedback
larger and bluer that modern galaxies.
nothing but quasars.
smaller, bluer, and more irregular than modern ones.Student Response  
Student Response redder, due to the recession of the universe.0%
very well formed into clusters of nothing but spirals.
Score:0/5

17.

QM12 - Q17

________ galaxies may bridge the gap between spiral galaxies and quasars.
Student ResponseValueCorrect AnswerFeedback
Hickson
Arp
Core-halo
Student Response Seyfert100%Student Response  
Hubble
Score:5/5

18.

QM12 - Q18

The largest voids may span 300 million light years across.
Student ResponseValueCorrect Answer
True100%True
Score:5/5

19.

QM12 - Q19

A radio galaxy whose lobes are swept back as if forming a tail. This probably indicates that
Student ResponseValueCorrect AnswerFeedback
this is evidence for intergalactic matter.Student Response  
the galaxy is about to evolve into a spiral.
the galaxy is isolated, not part of a cluster.
Student Response the galaxy is moving towards Earth.0%
there must be another galaxy nearby.
Score:0/5

20.

QM12 - Q20

The pregalactic blobs had masses similar to
Student ResponseValueCorrect AnswerFeedback
the earth.
the Sun.
Student Response globular clusters.100%Student Response  
the Large Magellanic Cloud.
the Milky Way.
Score:5/5

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