In 1979, the Pioneer 11 probe investigated the magnetosphere of Jupiter and discovered that Saturn had a complex magnetosphere buffeted by solar wind. (TNG: "Loud As A Whisper" ) The planetoid that Data (under the control of Lore) took the shuttlecraft El-Baz to in 2369 had a high amount of electromagnetic activity in the magnetosphere, making scans of the planet's surface impossible. (TNG: "Descent" )