One of the topics at the Pale Blue Dot workshop last week was detection of technological biosignatures.
Serious discussion on everything from “I Love Lucy”, early warning radars, and Dyson Sphere’s to isotopic signatures of fission waste disposal in main sequence stars. The latter is stranger than you think – consider Przybylski’s Star.
My particular favourite is the prospect of finding a pulsar, or several pulsars – preferably millisecond pulsars; with a period derivative exactly equal to zero…
So, I got to thinking. What can we actually see on Earth from space?
Artistics monuments to vanity. And imagine how they’d look with the original limestone cladding shining brilliant white.
This is what we will see from distant civilizations, whether live, or dead relics of past cultures.
Monumental conceptual art, lasting for millions of years.
Christo on the Moon, or at L2, done with the budget of the manic space cadet grandson of a dot-commer.
Like this – the Allen Array may not last, the Square Kilometer Array may rust to nothing, but the Third and Greatest Installation of Umbrellas could last an eon.
But, will we know it when we see it?