The Lewin experiment on the Voyager lander back in the 1970s detected biological activity. There won’t be any “face-builder” civilization though. :’)
“detected biological activity”
to be accurate, they did not detect “biological activity”
they detected what “could” represent evidence of “past” biological avtivity
and in fairness to me, I actually said “seemingly barren” landscape, leaving to future exploration to determine if what seems barren is actually barren, or not