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Voyager 2 revealed storms raging in Neptune's atmosphere. The largest one was named the "Great Dark Spot" which is a storm that's similar to Jupiter's Great Red Spot--including its geographic location on the planet. It has winds up to 1,000 miles an hour.
Astronomers could not locate this storm with the Hubble telescope after it was re-calibrated in 1994.
Voyagers continue to send back data, even after 30 years. The Cosmic Ray Subsystem team studies measurements of cosmic rays left. The data is sensitive to low-energy phenomena in interplanetary space including solar flares. This report is updated Monday-Friday before noon.
Here's a page with links to the most data (top left) returned by the two Voyagers.
Perhaps the greatest adventure of the Voyager program is yet to come. Voyager 1 is 9.7 billion miles from Earth, farther than any human-made object has ever traveled. In 2004, it crossed the heliosphere where solar winds slow as they hit the thin gas that fills the void between the stars. What's next for Voyager? Stargazers who were able to last through the entire movie, Star Trek: The Motion Picture, may already know.
Spoiler: In the movie, Voyager flew into a black hole and was discovered by mechanical life forms who gave it their artificial intelligence and a cloud-like ship. It was called V'ger after the "oy" on its name plate was obscured. V'ger threatened to remove humans from Earth but Kirk and Spock outwit it and save the planet.