Over Time, What Is the Net Effect of the Star-Gas-Star

question 47

Multiple Choice

Over time, what is the net effect of the star-gas-star cycle in the Milky Way?

• A) The total mass in the galaxy's interstellar medium is gradually increased, and the new gas is continually enriched in heavy elements.
• B) The total mass in the galaxy's interstellar medium is gradually reduced, and the remaining gas is continually enriched in heavy elements.
• C) The temperature of the interstellar medium varies between the cool 10-50 degrees (Kelvin) required to form stars and the 2000-30,000 degree (Kelvin) temperatures of the outer layers of the stars that form. But over time, more and more of the interstellar medium remains cool.
• D) The gas of the interstellar medium is continually depleted in elements heavier than helium.
• E) There is no net effect to the cycle. Mass in the interstellar medium lost to star formation is exactly replaced by stellar winds and supernova explosions.

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Definitions:

Unconscious Mind

A segment of the psyche that remains hidden from conscious awareness yet influences feelings and actions.

Acceptable Thoughts

Thoughts that are considered socially or morally suitable by one's self or societal norms.

Memories

A record or storage of experiences, information, and skills learned over time, retained in the human brain.

Trait Theories

Theories that focus on identifying, describing, and measuring individual differences in behavioral predispositions.