Voyager 1 is a space probe launched by NASA on September 5, 1977. Part of the Voyager program to study the outer Solar System, Voyager 1 launched 16 days after its twin, Voyager 2. Having operated for 40 years, 2 months and 24 days as of November 29, 2017, the spacecraft still communicates with the Deep Space Network to receive routine commands and return data. At a distance of 141 AU (2.11×1010 km) from the Sun as of November 22, 2017, it is the farthest spacecraft from Earth as well as the farthest human-made object. It is also the most distant object in the solar system whose location is known, even farther than Eris (96 AU) and V774104 (~103 AU).