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Speculative evolution is often considered hard science fiction because of its strong connection to and basis in science, particularly biology. [4] Speculative evolution is a long-standing trope within science fiction, often recognized as beginning as such with H. G. Wells's 1895 novel The Time Machine, which featured several imaginary future ...
The possibility of life-forms being based on "alternative" biochemistries is the topic of an ongoing scientific discussion, informed by what is known about extraterrestrial environments and about the chemical behaviour of various elements and compounds. It is of interest in synthetic biology and is also a common subject in science fiction.
A major theme of science fiction and of speculative biology is to convey a message of optimism or pessimism according to the author's worldview. [5] [6] Whereas optimistic visions of technological progress are common enough in hard science fiction, pessimistic views of the future of humanity are far more usual in fiction based on biology. [4]
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Greenworld (Japanese: グリーンワールド Hepburn: Gurīn wārudo) is a 2010 speculative evolution and science fiction book written by Scottish geologist and paleontologist Dougal Dixon and primarily illustrated by Dixon himself, alongside a few images by other artists.
After Man: A Zoology of the Future is a 1981 speculative evolution book written by Scottish geologist and paleontologist Dougal Dixon and illustrated by several illustrators including Diz Wallis, John Butler, Brian McIntyre, Philip Hood, Roy Woodard and Gary Marsh.
All Tomorrows: A Billion Year Chronicle of the Myriad Species and Mixed Fortunes of Man is a 2006 work of science fiction and speculative evolution written and illustrated by the Turkish artist C. M. Kosemen under the pen name Nemo Ramjet.
Lithopanspermia is the proposed transfer of organisms in rocks from one planet to another through planetary objects such as in comets or asteroids, and remains speculative. A variant would be for organisms to travel between star systems on nomadic exoplanets or exomoons.