Optical SETI Archives

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Astronomy & Telescopes, Biosignatures & Paleobiology, Habitable Zones, Imaging & Spectroscopy, Intelligence & Language, Interstellar, SETI & Technosignatures, Status Report

Optical SETI At ESO In The 2040s

by Keith CowingDecember 23, 2025December 23, 2025

The searches for other life and for intelligence are fundamental problems that science faces today. Most searches so far have been focused on radio, but optical laser communication is an […]

Transit zones for all solar system planets are plotted in heliocentric ecliptic coordinates (left) and in celestial coordinates (right). Each planet’s transit zone is shown as a colored sinusoidal band. Sensors located in the colored regions of sky could detect the corresponding planets as they transit the Sun. Overlaps between colored bands indicate regions where multiple planets could be detected. Note there are 28 regions of overlap between sets of two planet transit zones and 8 regions of overlap for sets of three planets. We adapt code from Wells et al. (2018) and use the updated transit zone geometry (Figure 1) to calculate and plot the full transit zone angles as ϕTZ = 2 arcsin((R⊙ − Rp)/r). -- astro-ph.IM

Astronomy & Telescopes, Biosignatures & Paleobiology, Imaging & Spectroscopy, Intelligence & Language, Press Release, SETI & Technosignatures

Technosignature Searches With Real-time Alert Brokers

by Keith CowingJune 18, 2025June 18, 2025

We present an exploration of technosignature research that is possible using real-time alert brokers from surveys such as the Zwicky Transient Facility (ZTF) and the upcoming Legacy Survey of Space […]

A ∼15 × 20arcmin unfiltered photo of stars surrounding HD89389 taken simultaneously with the appearance of “strange” pulses described below. Nothing was seen moving through this field in any of the 35 frames taken during this observation. -- Science Direct

Astronomy & Telescopes, Imaging & Spectroscopy, SETI & Technosignatures, Status Report

Unexplained Starlight Pulses Found In Optical SETI Searches

by Keith CowingMay 19, 2025May 19, 2025

Years spent searching more than 1300 sun-like stars for optical SETI signals have finally yielded unexpected results.

Astronomy & Telescopes, Imaging & Spectroscopy, Press Release, SETI & Technosignatures

PANOSETI Expansion At Lick Observatory

by Keith CowingNovember 16, 2023November 16, 2023

PANOSETI, or “Panoramic SETI or Pulse All-sky Near Infrared Optical SETI ” is an exciting and innovative project in the field of astronomy and the search for extraterrestrial life. It […]

Astronomy & Telescopes, Imaging & Spectroscopy, Press Release, SETI & Technosignatures

Panoramic SETI: Program Update and High-Energy Astrophysics Applications

by Keith CowingOctober 5, 2022October 5, 2022

Optical SETI (Search for Extraterrestrial Intelligence) instruments that can explore the very fast time domain, especially with large sky coverage, offer an opportunity for new discoveries that can complement multimessenger […]