Are We Missing Alien Lighthouses?

• Current SETI efforts focus on nanosecond laser bursts near parent stars, likely missing continuous, long-duration beacons used for interstellar communication.
• Researchers propose the "Cosmic Lighthouses Project" to detect mass-producible, micro- to millisecond-duration laser pulses located in interstellar space.
• Existing surveys like PANOSETI are currently ill-equipped to resolve these types of signals due to lower resolution and focus.

The Logic of Interstellar Beacons

• Advanced civilizations seeking cost-effective communication would likely rely on robust, mass-producible laser systems rather than complex, femtosecond-pulse technology.
• To avoid stellar interference, these "lighthouses" would likely be positioned in interstellar orbits or on the outskirts of solar systems.

The Proposed Solution

• The Cosmic Lighthouses Project utilizes three specific technologies to improve survey capabilities:
  • Off-the-shelf GPUs for processing massive image data.
  • qCMOS detectors to enhance contrast and image resolution.
  • Mass-producible diffractive-refractive lenses for wide-field imaging.
• A 1m telescope equipped with this tech could detect 100 MW lasers with 10-microsecond pulses within a 20-parsec (65 light-year) radius, covering approximately 3,000 stars.

Current Status

• The project remains a proposal without a clear funding path or implementation schedule.
• Experts suggest that the relatively low cost of the system could attract private philanthropic support.