Today I saw this article and a funny coincidence struck me: on the day this article was posted, rd95 and I were on a long drive, and one of the podcasts we listened to was the 9/27 episode of Point of Inquiry, Lee Billings on the Search for Life in a Silent Universe. http://pca.st/0wxk
The premise of this article is that we may not be finding other intelligent life because it is buried in planets and moons like Enceladus with subsurface oceans. If intelligent beings evolved on such a world, would they even know the rest of the universe exists? When taking these frozen over oceans into account, we effectively move the boundary of the habitable zone of our solar system out potentially as far as Pluto. I brought these points up while we were listening, and now I'll pose some questions to you:
What are your thoughts on Fermi's paradox?
How likely do you think life might be on subsurface ocean worlds?
Where else might we not be thinking to look?