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Ward and Brownlee are open to the idea of evolution on other planets that is not based on essential Earth-like characteristics such as DNA and carbon. As for the possible risks, theoretical physicist Stephen Hawking warned in 2010 that humans should not try to contact alien life forms. He warned that aliens might pillage Earth for resources.
The question of whether other inhabited planets or moons exist was a natural consequence of this new understanding. It has become one of the most speculative questions in science and is a central theme of science fiction and popular culture. [4] An alternative name for it is "Extraterrestrial Technological Instantiations" (ETI).
Extraterrestrial life forms might, for example, choose to allow contact once the human species has passed certain technological, political, and/or ethical standards. Alternatively, they may withhold contact until humans force contact upon them, possibly by sending a spacecraft to an extraterrestrial-inhabited planet. In this regard, reluctance ...
We’re not quite as intriguing as we think we are.
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Alien pathogens could decimate the human population, which would have no immunity to them, or they might use terrestrial livestock or plants as hosts, causing indirect harm to humans. [45] Invasive organisms brought by extraterrestrial civilizations could cause great ecological harm because of the terrestrial biosphere's lack of defenses ...
The book ends by examining the question of whether humanity is a parochial Earth-centric concept, or whether intelligent alien life should also be considered human. The book draws on the work of paleontologist Simon Conway Morris on convergent evolution , [ 9 ] and on Universal Darwinism , popularised by Richard Dawkins .
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