On This Day: June 13, 1983 — Pioneer 10 Leaves the Solar System
At 2:00 AM Pacific time on June 13, 1983, an 11-year-old NASA probe weighing less than a small car crossed an invisible line in space and made history. Pioneer 10 became the first human-made object to leave the solar system, slipping past the orbit of Neptune at a distance of 2.8 billion miles from Earth….