Simon Goodwin, professor of theoretical astrophysics at the University of Sheffield in England, has dedicated his efforts to exploring different ways to find evidence of the existence of technological alien civilizations.
According to Goodwin, there are three main ways to search for traces of alien civilizations. The first is to search for attempts at communication, and the second is to find evidence of visits to the solar system. The third way is to identify signs of the presence of large-scale alien giant structures in space.
Simon points out in an article he wrote that a team of astronomers decided to focus on the third approach, directing their research to identifying signs of Dyson balls, which are giant structures that can surround stars to capture their energy.
Freeman Dyson proposed in 1960 that Dyson's spheres would provide an excess of visible infrared radiation due to the absorption of light from the central star. The group then began searching for excess infrared radiation in seven stars identified as potential candidates.
Another possible sign is the decrease in visible light from the star as the massive structure passes between it and the observer. However, there are natural explanations for these signatures, such as gas disks, cosmic dust, or comets.
There is considerable doubt about the actual existence of Dyson spheres, as civilizations capable of constructing them have likely evolved beyond the need for such structures, due to the technological advances and energy efficiency that have been achieved.
Despite the skepticism, Simon Goodwin recognized the importance of investigating the possible signatures of alien massive structures, even taking into account that ultra-advanced civilizations would likely have more efficient methods of obtaining energy than building such structures around stars.
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