Calculate the main-sequence lifetimes of the following stars of different spectral types: 
, 
, 
, 
,and 
.What trend do you notice in your results?
Definitions:
American Dream
The ethos of the United States, representing the set of ideals (democracy, rights, liberty, opportunity, and equality) in which freedom includes the opportunity for prosperity and success.
Oprah Winfrey
Oprah Winfrey is a prominent media executive, actress, talk show host, television producer, and philanthropist known for her influential role in media and her philanthropic efforts.
Residential Segregation
The geographical separation of the poor from the rest of an area’s population.
Zoning Rules
Regulations established by local governments determining how particular geographic areas can be used, affecting land use, building sizes, and the purpose of structures.
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