For example if the Betelgeuze system had a planet, with a theoretical large telescope on that planet and looked back at earth. It would see life and civilizations from the 15th century a.d. (~500 light years distance)
For example if the Betelgeuze system had a planet, with a theoretical large telescope on that planet and looked back at earth. It would see life and civilizations from the 15th century a.d. (~500 light years distance)
You mention “the builders”, and that brought me to this series. Ring a bell?
https://www.goodreads.com/series/41758-heritage-universe
I found it!! By Jack McDevitt
Awesome! Thanks for that, always adding new sci-fi to my library