ASTR 123 Assignment Example | Topics and Well Written Essays - 250 words - 2

ASTR 123 - Assignment Example It remains unclear what chain of circumstance led to the emergence of life on Earth. However, scientists believe that the long period of relatively stable climate originating from the stable orbit of the planet at the favorable distance from a proper type of star are necessary factors of complex life on Earth (Guangxian and Xiao 33-34). The Rare Earth Theory holds that few planets can support the kind of complex life that the Earth supports. It contradicts the mediocrity principle which assumes Earth is a typical planet and that there is not much that is special about humanity. Other analysis suggests that the only planet that is capable of supporting complex life is the Earth. Proponents of the Rare Earth Theory indicate the long list of circumstances required for the evolution of complex life on earth. The creation of life requires water, and no planet apart from the Earth if known to have liquid water in large quantities. Many other planets do not have the right temperature to keep water liquid. Therefore, complex life cannot be found in such planets (Guangxian and Xiao 36). Considering that the galaxy is a very thin circular disk of stars of radius approximately 50,000 light years with 2500 civilizations in our galaxy capable of communication, the approximate separation of these civilizations in light years will be the perimeter divided by the number of civilizations. Based on the suggestions and responses of people, humans do not have the right characteristics to foster sustainability. Many of the respondents suggested that humans are moral, selfish, and lazy. The respondents feel that majority of human beings seek their own personal interest, want power, and work for selfish gains. Even though many people remain moral, majority do not have the characteristics to foster sustainability. Guangxian, Xu, and Xiao Jimei. New Frontiers in Rare Earth Science and Applications: Proceedings of the International Conference on Rare Earth Development and Applications