Question 1

We currently live in the universe during its:

Accepted Answer

A)  era of stars. 
B)  era of degeneracy. 
C)  era of black holes. 
D)  era of darkness.

Question 2

Rank from smallest to largest: galaxy cluster,galaxy group,galaxy supercluster.

Accepted Answer

The answer of Rank from smallest to largest: galaxy cluster,galaxy...

Question 3

The fact that we do not observe any stars with chemical compositions matching our predictions for the very first generation of stars implies:

Accepted Answer

A)  our ideas of what the first stars were like are incorrect. 
B)  our technology is not accurate enough to detect the light of the first stars. 
C)  the first stars died quickly, which implies a high mass. 
D)  the first stars died quickly, which implies a low mass.

Question 4

The observed abundances of helium and deuterium in the universe:

Accepted Answer

A)  support models of Big Bang nucleosynthesis. 
B)  disprove the Big Bang model of the universe. 
C)  do not match predictions. 
D)  contradict the density of matter observed in the universe.

Question 5

Structure formation in the universe proceeds hierarchically,meaning that:

Accepted Answer

A)  large objects collapse then fragment to form smaller objects. 
B)  large objects form at the same times as smaller objects. 
C)  small objects collapse then merge to form larger objects. 
D)  only small objects form and are stable over time.

Question 6

The very first generation of stars has never been observed.Explain what this implies about the properties of these stars.

Accepted Answer

The answer of The very first generation of stars has...

Question 7

Which part of our Milky Way Galaxy is the oldest?

Accepted Answer

A)  bulge 
B)  disk 
C)  halo 
D)  Cannot measure relative ages of these structures.

Question 8

The first generation of stars most likely formed ________ when the stars died.

Accepted Answer

A)  black holes 
B)  neutron stars 
C)  novae 
D)  white dwarfs

Question 9

If the quantum fluctuations imprinted on the dark matter halos at the time of the formation of the cosmic microwave background radiation were 10 times larger,galaxies would likely be:

Accepted Answer

A)  smaller. 
B)  larger. 
C)  more numerous. 
D)  nonexistent.

Question 10

Evaluate some of the difficulties in modeling the evolution of galaxies.

Accepted Answer

The answer of Evaluate some of the difficulties in modeling...

Exam 17: Formation of Structure