Astrophysics of Red SupergiantsAstrophysics of Red Supergiants is the first book of its kind devoted to our current knowledge of red supergiant stars, a key evolutionary phase that is critical to our larger understanding of massive stars. Red supergiants occupy a unique niche in massive stellar evolution as extremely large and cool stars, the progenitors of core collapse supernovae, and potential probes of extragalactic stellar populations. As a result, these stars have enormous