Jamie Carter
ForbesAre there advanced alien “supercivilizations” lurking in our galaxy? If there are, they may use massive megastructures, such as a “Dyson sphere,” to harvest solar energy directly from a star. As first reported in the New Scientist, a recent study of millions of stars revealed 60 that displayed an excess of infrared heat—a characteristic of blocking a star's light.
Is this a smoking gun for the so-called Dyson spheres? No—just the possibility of them. It's essentially a checklist of stars to study further, using public data, and an early attempt to find an excellent way to search for signs of life in the cosmos.
What Is A Dyson Sphere?
Coined as a concept by physicist Freeman Dyson in 1960, a Dyson sphere is a speculative concept of what an advanced civilization’s power plant might look like. It’s essentially a wraparound structure that entirely conceals a star to harvest all or most of its energy.Many believe that searching for these kinds of structures—called technosignatures—could be a good way of identifying alien civilizations at great distances, mainly by analyzing starlight for anomalies. The search is based on the concept that a star with a Dyson sphere around it will emit more infrared light, as heat, than its brightness suggests.
‘Project Hephaistos’
The revelation that Dyson spheres may exist in the Milky Way comes via two papers published in the Monthly Notices of the Royal Astronomical Society.One comes from Project Hephaistos, a “search for extraterrestrial intelligence using indirect signatures of astroengineering.” It’s based at Upsala University in Sweden. Using data from Gaia—a satellite that measures distances to and between stars using parallax—astronomers produced a list of seven red dwarf stars (from a sample of five million stars) that emit up to 60 times more infrared heat than expected. It could be Dyson spheres—or disks of dust and debris around the stars, which are common among young stars. (The team’s paper from 2022 concluded that fewer than one in 50,000 stars within 100 parsecs (326 light-years) could potentially host Dyson spheres that are 90% complete.)
Another separate paper published in March by researchers at the International School for Advanced Studies in Trieste, Italy, searched for 4,898,812 benchmark stars in the Gaia data and identified 53 candidate stars that display an excess of infrared radiation—most of them older stars that probably don’t have protoplanetary disks of dust and debris around them.
What Does It Mean?
It’s hugely speculative, but if a Dyson sphere (or a partial Dyson sphere, or a “Dyson swarm”—lots of satellites gathered around a star) did exist around any of these stars, then it could be considered evidence of Type 2 or “stellar” civilization. ... Full Story @ ForbesDid Nikola Tesla Speak with Extraterrestrials ?
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