Stars are the most widely recognized astronomical
objects, and represent the most fundamental building blocks of
galaxies.
The age, distribution, and composition of the stars in a galaxy trace
the history, dynamics, and evolution of that galaxy.
Moreover, stars are responsible for the manufacture and distribution
of heavy elements such as carbon, nitrogen,
and oxygen, and
their characteristics are intimately tied to the characteristics of
the planetary systems that may coalesce about them.
Consequently, the study of the birth, life, and death of stars
is central to the field of astronomy.