Astronomy: Books

The determination of stellar ages has been - and still is - crucial for the development of our understanding of the universe, and to constrain theoretical models for the formation of galaxies and the evolution of planetary systems. Stellar ages provide scientists with timescales, and these timescales allow us to identify the relevant physical processes responsible for the development of cosmic structures. This book describes in a simple, yet rigorous, manner the vast array of techniques that have been developed and are currently being used to determine the ages of stars. It also explores how stellar ages inform our knowledge about planets, star clusters, galaxies, even distant galaxies that we cannot resolve into individual stars.

The story behind the elite scientists, technologists, SF enthusiasts, and billionaires who believe that humanity's destiny is to populate the stars . . . Does humanity have a destiny "in the stars?" Should a species triggering massive extinctions on its own planet instead stay put? This new book traces the waxing and waning of interest in space settlement through the decades, and offers a journalistic tour through the influential subculture attempting to shape a multiplanetary future.