A research team led by Dr. Sofia Sheikh of the SETI Institute, in collaboration with the Characterizing Atmospheric Technosignatures project and the Penn State Extraterrestrial Intelligence Center, set out to answer a simple question: If an extraterrestrial civilization existed with technology similar to ours, would they be able to detect Earth and evidence of humanity? If so, what signals would they detect, and from how far away?
Researchers used a theoretical, modeling-based method, and this study is the first to analyze multiple types of technosignatures together rather than separately. The findings revealed that radio signals, such as planetary radar emissions from the former Arecibo Observatory, are Earth’s most detectable technosignatures, potentially visible from up to 12,000 light-years away.
The research is published in The Astronomical Journal.
One of the biggest reasons for colonizing other worlds is to ensure we don’t die with our own sun, but even those alien suns we might travel to will die one day. And yet, our image of stars living than erupting spectacular as a red giant or supernova, present a somewhat false impression, as those stellar remnants often last far longer than the stars which bore them. Could civilizations survive around these dead stars? Could they even outlast the End of the Universe, as the last stars fade away?
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/ dying-stars-narration-only Credits: Civilizations at the End of Time: Dying Stars Episode 178, Season 5 E12 Written by: Isaac Arthur Editors: Andrew Norman Darius Said Evan Schultheis Keith Blockus Konstantin Sokerin Matthew Acker Stuart Graham https://beyondnerva.wordpress.com Cover Art: Jakub Grygier https://www.artstation.com/jakub_grygier Graphics by: Fishy Tree https://www.deviantart.com/fishytree/ Jarred Eagley Jeremy Jozwik https://www.artstation.com/zeuxis_of_… Ken York
/ ydvisual Sergio Botero https://www.artstation.com/sboterod?f… Produced & Narrated by: Isaac Arthur Music: Markus Junnikkala, “Always Tell Me the Odds” https://www.markusjunnikkala.com/ Lombus, “Hydrogen Sonata” https://lombus.bandcamp.com A.J. Prasad of Dark Future, “Staring Through, pt1”
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Asteroid samples fetched by NASA hold not only the pristine building blocks for life but also the salty remains of an ancient water world, scientists reported Wednesday.
The findings provide the strongest evidence yet that asteroids may have planted the seeds of life on Earth and that these ingredients were mingling with water almost right from the start.
“That’s the kind of environment that could have been essential to the steps that lead from elements to life,” said the Smithsonian Institution’s Tim McCoy, one of the lead study authors.
Amid the swirling vastness of galaxies, each a cosmic city of stars and planets, the silence raises a compelling question: could the very nature of galaxies themselves hold the key to why intelligent life remains unseen?
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/ discord Credits: The Fermi Paradox: Galactic Great Filters Episode 484; January 30, 2025 Written, Produced & Narrated by: Isaac Arthur Select imagery/video supplied by Getty Images Music Courtesy of Epidemic Sound http://epidemicsound.com/creator Phase Shift, “Forest Night” Chris Zabriskie, “Unfoldment, Revealment” Stellardrone, “Billions and Billions“
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