Voyager 1 has been moving through space since 1977, now faster than a speeding bullet, and it still has not covered a single light-year of distance from Earth

It is NASA’s Voyager 1, launched Sept. 5, 1977, and it is the farthest human-made object there is. The gap between how fast it moves and how little ground it has covered is, I think, the best thing Voyager can teach anyone about the size of space. Voyager is doing more than ten miles a second and has been doing roughly that since the 1970s. After nearly fifty years at that speed, Voyager 1 is now more than 170 astronomical units from Earth, over 25 billion kilometers away. At its current pace, covering a single light-year would take Voyager 1 roughly 18,000 years.