What is characteristic of a main sequence star?
Answer:
a. Rapid rotation and a strong stellar wind
b. Nuclear fusion in the core varies according to the amount of gravitational contraction that occurs.
c. The rate of nuclear energy generated in the core equals the rate of energy radiated from the surface.
d. all of the above
e. none of the above
Evidence for star formation theory comes from:
Answer:
a. Tracking one star through time.
b. Plotting stars on the Hertzsprung-Russell diagram.
c. Studying different objects at different stages of evolution and piecing together an evolutionary picture.
d. Emission nebulae, exclusively.
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?
Answer:
a. One star forms at its center and blows the rest of the matter back into space.
b. One star forms and the rest of the matter goes into making planets, moons, and other objects of a solar system.
c. The cloud fragments into smaller clouds and forms many stars at one time.
d. The cloud is disrupted by its own rotation so that it reduces its mass down to that of a typical star.
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