On Sunday, February 16, 2025 at 3:17:36 PM UTC-7 Alan Grayson wrote:
On Sunday, February 16, 2025 at 3:05:35 AM UTC-7 Alan Grayson wrote: On Sunday, February 16, 2025 at 1:15:08 AM UTC-7 Liz R wrote: 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 <http://downthetubes.net?action=user_content_redirect&uuid=3db7bff95e9b50c5deb4580ff206dec3aada5856af55f34ca01b73a47fef84a0&blog_id=53307203&post_id=167783&user_id=21673507&subs_id=9373912&signature=28acbcd3eaa379d853501a2847b53910&email_name=new-post&[email protected]&encoded_url=aHR0cHM6Ly93d3cucHNldGkucHN1LmVkdQ=>*, set out to answer a simple question: If an extraterrestrial civilisation 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? <https://mail.google.com/mail/u/0/#label/__DownTheTubes__/FMfcgzQZTCjfmGkWRClxNpKPbVcTCqzl> https://mail.google.com/mail/u/0/#label/__DownTheTubes__/FMAfcgzQZTCjfmGkWRClxNpKPbVcTCqzl <https://mail.google.com/mail/u/0/#label/__DownTheTubes__/FMfcgzQZTCjfmGkWRClxNpKPbVcTCqzl> The link doesn't work. My best guess is that beyond about 50 light years, the signal, which is an expanding sphere, attenuates, and can't be detected above the background noise. AG See https://www.youtube.com/watch?v=Od-1V9ZR2Kc , where the claim is 12,000 light years. I don't believe it. AG. Maybe I'm confusing the detection of a radio signal leaving Earth and being detected by aliens having our level of technology, with issues concerning atmospheric properties. AG -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/everything-list/7247e503-cdda-4c99-a2b5-c432c50274d9n%40googlegroups.com.
