Post by @paul
Voyager 1 is about to reach a distance no spacecraft has reached before: On November 18, NASA’s veteran explorer will become the first human-made object one light-day from Earth, roughly 16.1 billion miles away. At that distance, a radio message takes 24 hours to reach it and another 24 hours for a reply to return. The milestone follows an October communications scare, when NASA lost the probe’s signal for 48 hours before contact returned on its own, without troubleshooting commands from Earth.
