A very loose group of young, hot stars that formed together but are not gravitationally bound, slowly drifting apart over millions of years. These represent the most dispersed type of stellar grouping, often spanning hundreds of light-years.
The term was introduced by Soviet astronomer Viktor Ambartsumian in 1947 to describe groups of stars with common origin and motion but insufficient gravity to remain bound. 'Association' emphasizes the temporary, loose relationship between member stars.
Stellar associations are like cosmic high school reunions that happen just once! These stellar siblings are caught in the act of going their separate ways, never to meet again as they drift apart into the vastness of space.
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