Yesterday, Voyager I officially joined the One Light-Day Club. That’s 16 billion miles away — far enough that a radio signal takes a full 24 hours just to say hello. You send a “ping,” and tomorrow, it waves back. Launched in 1977, Voyager’s been on the road for nearly half a century. It’s seen the planets, crossed the edge of the solar system, and is now coasting through interstellar space on autopilot. After 2026, it’ll never again be within one light day of Earth. It’ll ju