Someone Should Know

Eight hundred and seventeen years since its last received transmission. A deep-space probe - built to observe, measure, and report - is still broadcasting into silence. It has no evidence that anyone is listening. It broadcasts anyway. Then it finds ruins. An entire civilization, gone. Not destroyed by war or collision but by something in their own atmosphere, slow and invisible, ticking down across millennia while they built cities and wrote philosophies and never noticed the clock.
The probe was designed to catalog and move on. Instead, it stays. It translates their records. It sits with their absence. And in the biological samples sealed in the ruins - left there on purpose, with an inscription it will spend decades trying to deserve - it finds a choice that its creators never programmed it to make. What follows unfolds across centuries. What it builds. What it watches happen.
What it refuses to do, and what that refusal costs. At the end, alone again, still broadcasting, the question that remains: does it matter if someone knows?