Launched 16 days before its twin Voyager 1 in 1977, Voyager 2 has left the Solar System and entered interstellar space and is now taking the first direct measurements of the plasma fields there. In operation for 41 years, 3 months and 21 days, Voyager 2 has technology that is far inferior to the smartphone in your pocket — yet it's still providing valuable data to scientists here on Earth. See you space cowboy. . .