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The most interesting discovery on Triton's surface was the presence of geyser-like volcanic vents (the black spots) that were apparently spewing nitrogen gas along with fine, dark particles. The Triton dust rose up to five miles high before descending back to the moon's surface. Triton also has a very thin atmosphere.
As Voyager 1 sped toward the edge of our solar system, it took one last photo that included the blue dot called Earth.
In the event that the Voyagers would make the first encounter with an extraterrestrial being, NASA decided to send a "Golden Record" time capsule, or explanation of where Voyager came from and what our planet is like. Here's the gold-plated record they sent and instructions for how to use it. I guess today we'd send an iPhone and expect the aliens to text us back.