JWST Just Examined Two Stars Suspected of Harboring Dyson Spheres. Here's What It Found…

Key Points:

• Astronomers used the James Webb Space Telescope (JWST) to investigate two of the strongest Dyson sphere candidates, hypothetical megastructures that could indicate advanced alien civilizations by their infrared waste heat emissions.
• The JWST revealed that the infrared excess from both candidates was not from Dyson spheres but from distant, infrared-bright galaxies perfectly aligned behind the stars, creating false positives.
• One background galaxy is a Hot Dust-Obscured Galaxy (Hot DOG) with a supermassive black hole heating dust, while the other is a dusty starburst galaxy with intense star formation, both naturally producing the infrared glow initially attributed to Dyson spheres.
• This study not only ruled out two promising Dyson sphere candidates but also improved techniques for distinguishing true technosignatures from cosmic impostors, enhancing the reliability of future searches for extraterrestrial megastructures.
• The findings highlight the importance of false positive identification in the search for alien technology and provide valuable new targets for studying distant galaxies using adaptive optics guided by foreground stars.