Editing Freeman Dyson (section)

=== Dyson sphere ===
{{Main|Dyson sphere}}
In 1960 Dyson wrote a short paper for the journal ''[[Science (journal)|Science]]'' titled "Search for Artificial Stellar Sources of Infrared Radiation".{{sfn|Dyson|1960|pp=1667-1668}} In it he speculated that a technologically advanced [[Extraterrestrial life|extraterrestrial]] [[civilization]] might surround its native star with artificial structures to maximize the capture of the star's energy. Eventually, the civilization would enclose the star, intercepting [[electromagnetic radiation]] with [[wavelength]]s from visible light downward and radiating waste heat outward as [[infrared]] radiation. One method of [[Search for extraterrestrial intelligence|searching for extraterrestrial civilizations]] would be to look for large objects radiating in the infrared range of the [[electromagnetic spectrum]].

{{Blockquote | style=font-size:100% | One should expect that, within a few thousand years of its entering the stage of industrial development, any intelligent species should be found occupying an artificial biosphere which surrounds its parent star. |source={{harvnb|Davis|1978}}}}

Dyson conceived that such structures would be clouds of [[asteroid]]-sized [[space habitat]]s, though [[science fiction]] writers have preferred a solid structure: either way, such an artifact is often called a [[Dyson sphere]], although Dyson used the term "shell". Dyson said that he used the term "artificial biosphere" in the article to mean a habitat, not a shape. The general concept of such an energy-transferring shell had been created decades earlier by science fiction writer [[Olaf Stapledon]] in his 1937 novel ''[[Star Maker]]'', a source which Dyson credited publicly.<ref name=perimeterinstitute.ca />{{efn|name=Dyson1979p211}}