Bartleby Sitemap - Textbook Solutions
All Textbook Solutions for Horizons: Exploring the Universe (MindTap Course List)
5P6P7PCalculate the numb of communicative civilizations per galaxy using your n estimates of the factors in Table 20-1.The star cluster shown in the image in Figure UN 20-3 contains cool red giants and main-sequence stars from hot blue stars all the way down to red dwarfs. Discuss the likelihood that planets orbiting any of these stars might be home to life. (Hint: Estimate the age of the cluster.)2LTL