If the initial interstellar cloud in star formation has a mass sufficient to form hundreds of stars, how does a single star form from it?
A) One star forms at its center and blows the rest of the matter back into space.
B) The cloud fragments into smaller clouds and forms many stars at one time.
C) One star forms and the rest of the matter goes into making planets, moons, and other objects of a solar system.
D) The cloud is disrupted by rotation so that it reduces its mass down to that of a typical star.
E) A supernova blows the cloud up and dissipates the majority of the gas.
Question 2The broadening of spectral lines can be caused by:
A) density of the hot medium.
B) thermal motion of the hot atoms.
C) rotation of the star.
D) magnetic fields of the star.
E) All of the above
Question 3What are the important relics of the quark epoch? Why?
What will be an ideal response?
Question 4What prevents a brown dwarf from undergoing nuclear fusion?
A) Degeneracy pressure halts the contraction of a protostar so the core never becomes hot or dense enough for nuclear fusion.
B) There is not enough mass to maintain nuclear reactions in a self-sustaining way.
C) The surface temperature never rises high enough for the radiation to be trapped and heat their interior to the temperatures required for nuclear fusion.
D) Radiation pressure halts the contraction of a protostar so the core never becomes hot or dense enough for nuclear fusion.
E) There are too many heavy elements and not enough hydrogen for fusion to occur in a self-sustaining way.
Question 5Valles Marineris is the most striking example of a(n):
A) impact crater.
B) shield volcano.
C) oceanic trench.
D) rift valley.
E) scarp.
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