How Do We Know That at Least One Generation of Stars

question 18

Multiple Choice

How do we know that at least one generation of stars formed and died before the Milky Way's globular clusters formed?

• A) The stars of the oldest globular cluster have some heavy elements.
• B) They are so old that nuclear fusion in globular cluster stars has altered their chemical abundances.
• C) Globular clusters have a much higher hydrogen content than expected.
• D) The RR Lyrae stars found in globular clusters must be second-generation stars.
• E) All globular clusters reside in the disk of the Milky Way.

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Definitions:

Socialist Economy

An economic system in which the means of production, distribution, and exchange are owned or regulated by the community as a whole, with an aim toward equitable distribution of wealth and resources.

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A Nordic country in Northern Europe known for its advanced economy, high quality of life, and robust welfare system.

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A Canadian-American economist, public official, and diplomat known for his works on consumer behavior, organizational theory, and public policy.

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