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The Zoologist's Guide to the Galaxy. What Animals on Earth Reveal about Aliens – and Ourselves is a 2020 popular science book by the Cambridge University zoologist Arik Kershenbaum. It discusses the possible nature of life on other planets, based on the study of animal life on Earth.
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 ...
Grey-skinned (sometimes green-skinned) humanoids, usually 1 m (3.3 ft) tall, hairless, with large heads, black almond-shaped eyes, nostrils without a nose, slits for mouths, no ears and 3–4 fingers including thumb. Greys have been the predominant extraterrestrial beings of alleged alien contact since the 1960s. [5] Hopkinsville goblin [6] [7] [8]
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.
In The Invasion, the aliens are a virus. After the person falls asleep, the virus rewrites human DNA. Then, these genetically modified post-humans vomit a gelatinous substance to continue the invasion. As their invasion snowballs, the pod people transform humans by injecting them with the substance under the guise of "influenza vaccines".
Barlowe's Guide to Extraterrestrials (1979; second edition 1987) is a science fiction-themed book by artist Wayne Barlowe, with Ian Summers and Beth Meacham (who provided the text). It contains Barlowe's visualizations of different extraterrestrial life forms from various works of science fiction, with information on their planetary location or ...
The existence of extraterrestrial life is a scientific idea that has been debated for centuries. Initially, the question was purely speculative; in modern times a limited amount of scientific evidence provides some answers.
Intelligence is, along with the more precise concept of sapience, used to describe extraterrestrial life with similar cognitive abilities as humans. Another interchangeable term is sophoncy, being wise or wiser, first coined by Karen Anderson and published in the 1966 works by her husband Poul Anderson.