Why NASA's twin Voyagers probes are the most important spacecraft ever launched - and could be the last evidence of humanity's existence
Luckily, the galaxy will have NASA's twin Voyager spacecraft to remember us by.
The two nuclear-powered probes launched 40 years ago and became the first and only robots to take close-up photographs of Uranus and Neptune, the planets' moons and rings, and other objects in the outer solar system.
The Voyagers also carried with them a golden record of sounds, images, and other information life on Earth - a basic human catalog that aliens might one day discover and decode.
The mission is now detailed in a remarkable detail for PBS documentary called "The Farthest", which premiered on August 23 and will re-air on September 5 (the date of Voyager 1's launch).
"Fifty years from now, Voyager will be the science project of the 20th century," Brad Smith, a Voyager imaging scientist, said in the movie.
Here's why many scientists and engineers not only hail the Voyagers as the farthest, fastest, and longest-lived space mission, but also one of humanity's greatest endeavors.
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