Question 1

Before a giant molecular cloud can contract gravitationally, it must overcome four physical factors that resist compression.  What are these four factors?

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Question 2

Describe the concept of a "birth line" and identify where it falls on the H-R diagram.

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Question 3

Energy flows by radiation or convection inside normal stars but almost never by _____________ because radiation or convection is much more efficient.

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Question 4

Columns of gas in a nebula that point back toward a young, massive star are called _______________.

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Question 5

Hydrostatic equilibrium in a newborn star is regulated by a very unique thermostat called the _____________ thermostat.

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Question 6

How does a gas cloud become hot enough to ignite nuclear reactions?

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Question 7

Briefly describe the pressure-temperature thermostat in stars.

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Question 8

The force responsible for the collapse of an interstellar cloud is_____________.

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Question 9

Star clusters are important to the study the stellar evolution because stars in a given cluster have the same _____________.

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Quiz 11: Formation and Structure of Stars

Before a giant molecular cloud can contract gravitationally, it must overcome four physical factors that resist compression. What are these four factors?