On Sept. 5, 1977, Voyager 1 started its outer solar system research mission. Forty years later, it is the fastest moving man-made object, and the farthest from Earth. Voyager 1 is in fact the only spacecraft in the interstellar medium — the space between the stars, outside the solar system.

On Nov. 28, 2017, Voyager’s four backup trajectory correction maneuver thrusters were fired up for the first time in 37 years. Next day, the team learned that the thrusters had worked perfectly to orient the spacecraft.

The third poster in the United Space series was inspired by the triumph of the mind-blowing creativity and intelligence of the people who worked hard to design and construct this outstanding spacecraft.

The poster design is based on the Voyager mission images of Neptune, its moon Triton and the spacecraft itself, made available by NASA’s Jet Propulsion Laboratory.