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 was launched 16 days after its twin, Voyager 2. Having operated for 42 years, 1 month and 16 days as of October 21, 2019, the spacecraft still communicates with the Deep Space Network to receive routine commands and to transmit data to Earth. At a distance of 147. 347 AU (22. 0 billion km; 13. 7 billion mi) from Earth as of October 1, 2019 it is the most distant man-made object from Earth.