How will you concern yourself with issues of materials, technology, politics and economics, waxing and waning through countless eons? How do you imagine your users, your many million-times great-grandchildren, will come to experience it, being ultra-post-human as they are? Will you be that optimistic and not include a built-in fail safe monument to our extinct species? How will it endure such unimaginable timescales, when any potential site is subject to the hyper-migration of rivers and oceans, the deep exhalations of mountains, and continents splitting and evaporating? In an era of apocalypses, perhaps the only solution to our problems is to subject ourselves to the terrifying sublimity of deep time.

(All images are screen captures from John Dubinski's Future Sky. Cf. NASA's collision visualization.)