Voyager 1.Humanity’s First Step Toward a Light-Day in space
Nearly half a century after leaving Earth, NASA’s Voyager 1 spacecraft is approaching a milestone unlike any in human history. Within the next two years, it will become the first human-made object to reach a distance of one full light-day from Earth—the span light travels in 24 hours, or roughly 16 billion miles (25.7 billion…