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This Aug. 22, 2009 image made available by NASA shows a section of Saturn's rings, as seen from the Cassini spacecraft. (NASA/JPL-Caltech/Space Science Institute via AP)

This Aug. 22, 2009 image made available by NASA shows a section of Saturn's rings, as seen from the Cassini spacecraft. (NASA/JPL-Caltech/Space Science Institute via AP)

This April 25, 2007 image made available by NASA shows a part of the rings of the planet Saturn, as seen from the Cassini spacecraft. (NASA/JPL-Caltech/Space Science Institute via AP)

This April 25, 2007 image made available by NASA shows a part of the rings of the planet Saturn, as seen from the Cassini spacecraft. (NASA/JPL-Caltech/Space Science Institute via AP)

This July 6, 2017 image made available by NASA shows the planet Saturn on the sunlit side of the rings from a distance of about 47,000 miles (76,000 kilometers), as seen from the Cassini spacecraft. (NASA/JPL-Caltech/Space Science Institute via AP)

This July 6, 2017 image made available by NASA shows the planet Saturn on the sunlit side of the rings from a distance of about 47,000 miles (76,000 kilometers), as seen from the Cassini spacecraft. (NASA/JPL-Caltech/Space Science Institute via AP)

This Jan. 2, 2010 image made available by NASA shows the planet Saturn, as seen from the Cassini spacecraft. (NASA/JPL-Caltech/Space Science Institute via AP)

This Jan. 2, 2010 image made available by NASA shows the planet Saturn, as seen from the Cassini spacecraft. (NASA/JPL-Caltech/Space Science Institute via AP)