We conducted a search for narrowband radio signals over four observing sessions in 2020-2023 with the L-band receiver (1.15-1.73 GHz) of the 100 m diameter Green Bank Telescope.
Technosignatures
![Planets capable of supporting high O2 concentrations and, hence, technological civilizations. This figure shows the likely composition of planetary atmospheres based on mass and equilibrium temperature. For planets whose temperature and mass would lead to primarily CO2/N2/H2O atmospheres, high oxygen levels require a biological origin, i.e. photosynthesis. For higher equilibrium temperatures, high O2 levels can occur via the runaway greenhouse effect and the photolysis of water vapor at high altitudes. (Figure adapted from [7].) -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2023/08/TheOxygen.png?resize=1200%2C717&ssl=1)
Posted inAtmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Habitable Zones, SETI & Technosignatures, Status Report
The Oxygen Bottleneck For Technospheres
On Earth, the development of technology required easy access to open air combustion, which is only possible when oxygen partial pressure, P(O2), is above 18\%.
Posted inAI - Data - Apps - Cybernetics, Astronomy & Telescopes, SETI & Technosignatures, Status Report
Signal Synchronization Strategies And Time Domain SETI With Gaia DR3
Spatiotemporal techniques for signal coordination with actively transmitting extraterrestrial civilizations, without the need for prior communication, can constrain technosignature searches to a significantly smaller coordinate space.
Posted inAstronomy & Telescopes, Biosignatures & Paleobiology, Imaging & Spectroscopy, SETI & Technosignatures, Status Report
A VERITAS/Breakthrough Listen Search for Optical Technosignatures
The Breakthrough Listen Initiative is conducting a program using multiple telescopes around the world to search for “technosignatures”: artificial transmitters of extraterrestrial origin from beyond our solar system.
Posted inAstronomy & Telescopes, Imaging & Spectroscopy, SETI & Technosignatures, Status Report
Real-Time Technosignature Strategies With SN 2023ixf
Several technosignature techniques focus on historic events such as SN 1987A as the basis to search for coordinated signal broadcasts from extraterrestrial agents.
Posted inAstronomy & Telescopes, SETI & Technosignatures, Status Report
A 4-8 GHz Galactic Center Search for Periodic Technosignatures
Radio searches for extraterrestrial intelligence have mainly targeted the discovery of narrowband continuous-wave beacons and artificially dispersed broadband bursts.
Posted inAI - Data - Apps - Cybernetics, Astronomy & Telescopes, SETI & Technosignatures, Status Report
A Search for Extraterrestrial Technosignatures in Archival FAST Survey Data Using a New Procedure
The aim of “search for extraterrestrial intelligence” (SETI) commensal surveys is to scan the sky to find possible technosignatures from the extraterrestrial intelligence (ETI).
Posted inAstronomy & Telescopes, Press Release, SETI & Technosignatures
The Very Large Array Will Search For Signals From Extraterrestrial Civilizations
One of the world’s most powerful radio telescope arrays is joining the hunt for signals from other galactic civilizations. The National Science Foundation’s Karl G. Jansky Very Large Array (VLA), […]
Posted inAstronomy & Telescopes, SETI & Technosignatures, Status Report
Simulation Of The Earth’s Radio Leakage From Mobile Towers As Seen From Selected Nearby Stellar Systems
Mobile communication towers represent a relatively new but growing contributor to the total radio leakage associated with planet Earth.
Posted inAstronomy & Telescopes, SETI & Technosignatures, Status Report
Upper Limits On Transmitter Rate Of Extragalactic Civilizations Placed By Breakthrough Listen Observations
The Search for Extra-Terrestrial Intelligence (SETI) has been conducted for over sixty years, yet no technosignatures have been identified. Previous studies have focused on stars in our galaxy, with few […]