Understanding the stars is the bedrock of modern astrophysics. Stars are the

source of life. The chemical enrichment of our Milky Way and of the Universe

with all elements heavier than lithium originates in the interiors of stars. Stars

are the tracers of the dynamics of the Universe, gravitationally implying much

more than meets the eye. Stars ionize the interstellar medium and re-ionized

the early intergalactic medium. Understanding stellar structure and evolution

is fundamental