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Astrophysics

Project Hephaistos -- IV. James Webb Space Telescope Observations of Two Dyson Sphere Candidates

Erik Zackrisson, Arjan Bik

Featured July 16, 2026

Original Paper

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Simply

Scientists used a powerful space telescope to look closely at two stars that seemed to have extra heat, like a giant alien power plant, finding the extra heat was actually from distant galaxies hiding right behind them.

In depth
The paper definitively rules out two Dyson sphere candidates by using high-resolution JWST/MIRI observations. They found that the previously observed mid-infrared excess around these M-dwarf stars was not from hypothetical megastructures or debris disks, but from background galaxies located approximately 1 arcsecond away. A key innovation was the use of advanced PSF modeling to deblend the stellar and galactic light, revealing the true nature of these cosmic interlopers.

Key Takeaways

  • 1
    High-resolution JWST/MIRI imaging and spectroscopy definitively debunked two Dyson sphere candidates by resolving their mid-infrared excess into distinct background galaxies.
  • 2
    The study employed sophisticated PSF modeling with a brighter-fatter correction to accurately deblend the M-dwarf star and background galaxy fluxes, crucial for precise photometry.
  • 3
    The background galaxies were identified as a Hot Dust Obscured Galaxy () and a dusty starburst (), confirming their cosmological origin and ruling out local Dyson spheres.

Conceptual Flow

HIGH LEVEL
1
Methodology: Separating Blended Light

They used a super-sharp space telescope to take pictures and measure light colors, then used clever math to separate the star's light from the hidden galaxy's light.

Fuzzy Star Picture
Star's Expected Light
Separate Light Sources
Star's True Light
Galaxy's True Light
2
Results: Identifying the True Source

The extra heat around the stars was actually from two different types of faraway galaxies, proving the stars were normal and not surrounded by alien megastructures.

Star with Extra Heat
Identify Source
Normal Star
Hidden Galaxy (Type 1)
Hidden Galaxy (Type 2)