Voyager 2 flew past Neptune on August 25, 1989. Here, Ian Regan has taken a long sequence of Neptune images shot through many different filters in July and August 1989, as Voyager 2 approached. Regan aligned them to make a rough draft of a movie of the spinning planet. It will take much more work to generate color frames from the images. Voyager 2 was relaying the images to Earth as it was taking them, so its frame rate was limited by how fast it could send each image: images are separated in time by about 5 minutes. There were gaps in imaging as Voyager 2 turned its camera to photograph other features in the Neptune system (rings and moons).
We know you love reading about space exploration, but did you know you can make it happen?