JWST/MIRI data attribute the mid-IR excess of Hephaistos candidates D and E to background galaxies at z≈0.9 (Hot-DOG-like) and z≈0.4 (dusty starburst), not to Dyson spheres or debris disks.
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Project Hephaistos -- IV. James Webb Space Telescope Observations of Two Dyson Sphere Candidates
JWST/MIRI data attribute the mid-IR excess of Hephaistos candidates D and E to background galaxies at z≈0.9 (Hot-DOG-like) and z≈0.4 (dusty starburst), not to Dyson spheres or debris disks.