Posted on 18 June, 201318 June, 2013 by BillThe Storm! The north polar vortex of Saturn, as seen in a series of images captured by the robotic spacecraft Cassini on June 14, 2013. Credit: NASA/JPL/SSI. Animation by Bill Dunford. The motion of Saturn’s north polar vortex–as seen just last Friday by the robotic spacecraft Cassini. The eye is about 50 times larger than an Earthly hurricane’s, and the clouds at the outer edge are traveling at more than 150 meters per second. Learn more.