The Galactic Habitable Zone: Galactic Chemical Evolution

  title={The Galactic Habitable Zone: Galactic Chemical Evolution},
  author={Guillermo A. Gonz{\'a}lez and Donald Eugene Brownlee and Peter D. Ward},
Abstract We propose the concept of a “Galactic Habitable Zone” (GHZ). Analogous to the Circumstellar Habitable Zone (CHZ), the GHZ is that region in the Milky Way where an Earth-like planet can retain liquid water on its surface and provide a long-term habitat for animal-like aerobic life. In this paper we examine the dependence of the GHZ on Galactic chemical evolution. The single most important factor is likely the dependence of terrestrial planet mass on the metallicity of its birth cloud… 

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