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The spinning vortex of Saturn's north polar storm on Nov. 27, 2012. Taken using a combination of spectral filters sensitive to wavelengths of near-infrared light.NASA/JPL/Space Science Institute
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Saturn's lonely moon, Mimas on Nov. 30, 2004.AFP/Getty Images
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The rings of Saturn captured by Cassini before it entered the orbit on 21 Jun. 2004.SSPL/Getty Images
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A view of Saturn's moon Dione, taken during a close flyby on Jun. 16, 2015.NASA/JPL-Caltech/Space Science Institute
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The moons Titan, Mimas, and Rhea, captured by Cassini in this image released on Jun. 22, 2015.NASA/JPL-Caltech/Space Science Institute
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A geyser basin at the south pole of Enceladus on Nov. 30, 2010.NASA/JPL-Caltech/Space Science Institute
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A huge northern storm on Saturn In mid-Sept. 2004.Barcroft Media/Getty Images
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Chasms on Dione. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on April 11, 2015.NASA/JPL-Caltech/Space Science Institute
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Pandora on the edge of Saturn's ring on Nov. 8, 2009.NASA/JPL/Space Science Institute
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View of Saturn's rings as they surround the planet.Universal History Archive—UIG/Getty Images
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The Earth and the moon photographed by NASA's Cassini spacecraft on Jul. 19, 2013.NASA/JPL-Caltech/Space Science Institute
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Pale, icy Dione, taken on Oct. 11, 2005.NASA/JPL/Space Science Institute—NASA/JPL/Space Science Institute
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Red arcs in the northern area of Tethys on April 2015.NASA/JPL/Space Science Institute
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An aurora on Saturn. The composite image was made from 65 individual observations by Cassini's visual and infrared mapping spectrometer on Nov. 1, 2008. The observations were each six minutes long.NASA/SSPL/Getty Images
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The Cassini spacecraft captured the storms at Saturn's north pole in this false color image released in April 2013. The storm appears dark red while the fast-moving hexagonal jet stream framing it is a yellowish green. Low-lying clouds circling inside the hexagonal feature appear in orange. A second, smaller vortex pops out in teal at the lower right of the image. The rings of Saturn appear in vivid blue at the top right.NASA/JPL-Caltech/SSI
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Saturn's moon Enceladus brightly reflects sunlight before a backdrop of the planet's rings.Universal History Archive/UIG/Getty Images
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The Cassini spacecraft observed three of Saturn's moons set against the night side of the planet in this image from April 2011.NASA/JPL-Caltech/Space Science Institute
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Phoebe, captured during Cassini's flyby on Jun. 11, 2004.NASA/JPL-Caltech/Space Science Institute
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Five moons of Saturn dominated by Rhea in the foreground on Jan. 11, 2011.NASA/JPL/Space Science Institute—NASA/JPL/Space Science Institute
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The Cassini spacecraft takes one of its last good looks at Iapetus, a Saturnian moon.UIG/Getty Images
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Saturn's moon Hyperion, taken during a close flyby on May 31, 2015. This flyby marks the mission's final close approach to Saturn's largest irregularly shaped moon.NASA/JPL-Caltech/Space Science Institute
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The Cassini spacecraft captures a glimpse of the moon Atlas shortly after emerging from Saturn's shadow on Jan. 23, 2014.NASA/JPL-Caltech/Space Science Institute
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Mimas, Dione and Titan on May 27, 2015. The image is taken using a spectral filter which preferentially admits wavelengths of near-infrared light centered at 728 nanometersNASA/JPL/Space Science Institute
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A swing high above Saturn by NASA's Cassini spacecraft revealed this stately view of the golden-hued planet and its main rings on Oct. 10, 2013.NASA/JPL
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