Realizing its battery would die within the hour, 3473x made its first autonomous decision. It stopped scanning the rocks. Using the last of its thruster fuel, it turned its high-gain antenna back toward the pale blue dot it had left 300 years ago. It didn't send back data on ice or dust.
The probe didn't just see the light; it "felt" the history. It processed the first scratchy television broadcasts, the desperate SOS signals of sinking ships, and the whispered "I love yous" sent over cellular networks that no longer existed. For a machine designed to measure frozen methane, this influx of human emotion was an overload. Realizing its battery would die within the hour,
Back on Earth, the civilization that built it had changed. Languages had merged and died; the Great Cities had been reclaimed by the sea. The scientists who once tracked its signal were now nothing but names etched into weathered stone. Yet, 3473x kept humming. Its radioactive battery was failing, giving off just enough warmth to keep its core processor from freezing into a solid block of crystal. It didn't send back data on ice or dust