4 ms·
https://www.liebertpub.com/doi/10.1089/ast.2020.2364 https://www.liebertpub.com/doi/10.1089/ast.2020.2364 https://www.centauri-dreams.org/2021/04/20/a-drake-eq
by T-A 6y ago
https://www.liebertpub.com/doi/10.1089/ast.2020.2364 https://www.liebertpub.com/doi/10.1089/ast.2020.2364
https://www.centauri-dreams.org/2021/04/20/a-drake-equation-for-alien-artifacts/ https://www.centauri-dreams.org/2021/04/20/a-drake-equation-...