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How can you measure the mass of a star?
Extended Period
A length of time that is longer than usual or expected.
Primary Group
A small social group characterized by close, personal, and enduring relationships, which significantly influence the attitudes and ideals of those involved.
Concert Audience
The group of people who attend and watch a musical performance at a concert venue.
Secondary Group
A large and impersonal social group whose members pursue a specific goal or activity but typically have a detached and superficial relationship with one another.
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