An Astronomer Studying a Distant Cluster of Galaxies Finds That

question 35

Multiple Choice

An astronomer studying a distant cluster of galaxies finds that several of the galaxies are spiral-shaped, with a large nuclear region and tightly wound arms. How should the astronomer classify these galaxies?

• A) Sb
• B) SBb
• C) Sa
• D) Sc

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Definitions:

Child Poverty Rate

The percentage of children living in households with an income below the poverty threshold defined by national standards.

2007-2008

The period marked by the global financial crisis, beginning with the collapse of the housing bubble in the United States and leading to a worldwide economic downturn.

Poor Black Ghettos

Urban areas with a high population of African American residents, characterized by poverty and social disadvantages.

High Birth Rates

A demographic situation characterized by a significant number of births per 1,000 individuals in a population, often leading to population growth.