"When NASA’s Voyager 2 spacecraft flew by Uranus in 1986, it provided scientists’ first — and, so far, only — close glimpse of this strange, sideways-rotating outer planet."
https://www.jpl.nasa.gov/news/mining-old-data-from-nasas-voyager-2-solves-several-uranus-mysteries/?utm_source=join1440&utm_medium=email&utm_placement=newsletter