Using the data in the table below, identify the spectral type of a star that has a main-sequence lifetime of about 10 billion years. 
Definitions:
Gentrification
The process of middle-class people moving into rundown areas of the inner city and restoring them.
Gentrification
The process of renovating and improving a house or district so that it conforms to middle-class taste, often leading to the displacement of lower-income families and small businesses.
Sociologists
Social scientists who study human societies, their structures, processes, and changes, focusing on patterns of social interaction and behavior.
Fertility
Fertility refers to the natural capability to produce offspring, often measured by the number of births per population segment over a given time period.
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