Astronomy

1.	QM12 - Q1
	It is now believed the majority of mass for most galaxies lies in their dark halos. Student Response Value Correct Answer True 100% True Score: 5/5
2.	QM12 - Q2
	For nearby spirals, their rotation curves help measure both light and dark matter. Student Response Value Correct Answer True 100% True Score: 5/5
3.	QM12 - Q3
	While yet unseen, some gravitational evidence suggests the existence of dark galaxies. Student Response Value Correct Answer True 100% 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 Response Value Correct Answer True 100% True Score: 5/5
5.	QM12 - Q5
	Vast majority of the known volume of the universe lies in the voids. Student Response Value Correct Answer True 100% True Score: 5/5
6.	QM12 - Q6
	Rotation curves for spiral galaxies show Student Response Value Correct Answer Feedback 1. they are slowing down. 2. rotation speed drops off further from the nucleus.  3. most have dark halos. 100%    4. most of the mass lies in the nucleus. 5. no relation to mass. Score: 5/5
7.	QM12 - Q7
	As we look at larger and larger scales in the universe, we find Student Response Value Correct Answer Feedback 1. smaller and smaller masses. 2. almost exclusively visible matter. 3. a larger and larger percentage of the matter is visible.  4. a larger and larger percentage of the matter is dark. 100%    5. an equal amount of visible and dark matter. Score: 5/5
8.	QM12 - Q8
	Collisions between galaxies is thought to Student Response Value Correct Answer Feedback 1. have stopped about 5 billion years ago. 2. be commonplace.    3. have never occurred. 4. be extremely rare.  5. 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 Response Value Correct Answer Feedback 1. two-three times  2. tens of times 100%    3. hundreds of times 4. thousands of times 5. millions of times Score: 5/5
10.	QM12 - Q10
	Due to the galaxy density and collisions, ________ are rare in the centers of clusters. Student Response Value Correct Answer Feedback 1. irregulars 2. quasars  3. spirals 100%    4. black holes 5. blazars Score: 5/5
11.	QM12 - Q11
	Galaxies in clusters are much more likely to become "active" than ones alone in space. Student Response Value Correct Answer True 100% 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 Response Value Correct Answer True 100% True Score: 5/5
13.	QM12 - Q13
	Gravity lensing lets us map the distribution of both visible and dark matter. Student Response Value Correct Answer True 100% True Score: 5/5
14.	QM12 - Q14
	Which of these is NOT considered a fine example of galactic collisions? Student Response Value Correct Answer Feedback 1. the Cartwheel Galaxy 2. the Antennae Galaxies 3. the Whirlpool Galaxy  4. M-31 in Andromeda 100%    5. M -87 in Virgo Score: 5/5
15.	QM12 - Q15
	Astronomer's believe that a spiral galaxy may form Student Response Value Correct Answer Feedback 1. from a collision between a small and large galaxy.    2. due to a quasar shutting down.  3. from the sudden contraction of an elliptical galaxy. 0% 4. from the collision of two giant elliptical galaxies. 5. 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 Response Value Correct Answer Feedback 1. larger and bluer that modern galaxies. 2. nothing but quasars. 3. smaller, bluer, and more irregular than modern ones.     4. redder, due to the recession of the universe. 0% 5. 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 Response Value Correct Answer Feedback 1. Hickson 2. Arp 3. Core-halo  4. Seyfert 100%    5. Hubble Score: 5/5
18.	QM12 - Q18
	The largest voids may span 300 million light years across. Student Response Value Correct Answer True 100% 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 Response Value Correct Answer Feedback 1. this is evidence for intergalactic matter.    2. the galaxy is about to evolve into a spiral. 3. the galaxy is isolated, not part of a cluster.  4. the galaxy is moving towards Earth. 0% 5. there must be another galaxy nearby. Score: 0/5
20.	QM12 - Q20
	The pregalactic blobs had masses similar to Student Response Value Correct Answer Feedback 1. the earth. 2. the Sun.  3. globular clusters. 100%    4. the Large Magellanic Cloud. 5. the Milky Way. Score: 5/5