Purpose of scifi

Science fiction has often been concerned with the great hopes people place in science but also with their fears concerning the negative side of technological development; the latter is expressed in the classic theme of the hubristic scientist who is destroyed by his own creation.
Much science fiction attempt to generate a sense of wonder, or awe, from the setting, circumstances, or ideas presented. Paradigm shifts may be used to induce a sense of shock, or a change in the frame of reference for the reader.

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A popular notion is that science fiction attempts to predict the future. Some commentators go so far as to judge the "success" of a work of science fiction on the accuracy of its predictions. However, while some science fiction is set in the future, most authors are not attempting literally to predict it; instead, they use the future as an open framework for their themes. A science fiction writer is generally not trying to write a history of the future that they believe will happen, any more than a writer of westerns is trying to create a historically accurate depiction of the old West. Writers are as likely to write of a future that they hope will not happen as they are to write about a future they think will happen. Future societies and remarkable technological innovations are presented as enabling devices for cognitive exploration - or simply for entertainment - and the narratives are not meant to be predictive in any simple way. There are exceptions, however, especially in early science fiction.

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Eric S. Rabkin once wrote:
"The touchstone for scientific fiction, then, is that it describes an imaginary invention or discovery in the natural sciences. The most serious pieces of this fiction arise from speculation about what may happen if science makes an extraordinary discovery. The romance is an attempt to anticipate this discovery and its impact upon society, and to foresee how mankind may adjust to the new condition." (Pilgrims Through Space and Time [New York, 1947])
Subject matter
Science fiction covers numerous distinct subjects. Many of these were originally treated by early pioneers such as H. G. Wells and Jules Verne.

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The following subjects from works by Verne are found in much later science fiction:
Space travel (From the Earth to the Moon), 1865
The future (Paris in the 20th Century), 1863
Technology not yet invented (Submarines 20,000 Leagues Under The Sea), 1870
Mental changes in humans (The Green Ray), 1882
Terraforming (Invasion of the Sea), 1904
H.G. Wells pioneered the following subjects:
Biological changes in humans or animals (The Island of Dr. Moreau).
Time travel (The Time Machine).
Humans with extraordinary powers (The Invisible Man)
Contact with aliens from other worlds (The War of the Worlds)
Space travel (The First Men in the Moon)
The future (When the Sleeper Wakes)
The evolution of the human race (Men Like Gods)

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