<< Dyson spheres (DSR) are the stuff of highly advanced civilizations, commonly thought of as artificial spheres surrounding an entire star. (..) any of these configurations would have one unique, tell-tale sign—they would change that star's infrared signature. >>
Benjamin Zuckerman's << theory focuses on scanning white dwarves for anomalous infrared signatures that might indicate that an artificial construct surrounds them. But why white dwarves? Other than being reasonably ubiquitous, they have the distinction of being the end state of stars like our own. >>️
WISE and Spitzer << watched white dwarves with masses around what we would expect our own sun to turn into. They even noticed some incidences of anomalous infrared signatures. However, the researchers thought dust was the most likely cause of those anomalies, and there was no evidence of any DSR. (..) But the absence of evidence is not evidence of absence—it just helps to constrain the likelihood. (..) According to Dr. Zuckerman, with the observations we have already made, we can do a statistical calculation that less than 3% of habitable planets that orbit stars that eventually turn into white dwarves build a DSR around them. Granted, current estimates put the number of habitable planets around G-type stars that might ultimately evolve into white dwarves at 300 million—so there could still be upward of 9 million civilizations that have built a DSR around their white dwarf home star. But for now, the Fermi paradox still holds, and science continues to collect data that will either further constrain the estimates of the number of advanced technological civilizations in our galaxy or prove that we're not alone once and for all. >>️️
Andy Tomaswick. If there are Dyson spheres around white dwarfs, we should be able to detect them. Universe Today. May 10, 2022.
Benjamin Zuckerman. Infrared and Optical Detectability of Dyson Spheres at White Dwarf Stars. Monthly Notices of the Royal Astronomical Society. stac1113. doi: 10.1093/ mnras/stac1113. April 28, 2022.
Also
keyword 'esobio' | 'exobio' in FonT
Keywords: esobio, exobio, Dyson, Dyson sphere
