NASAのインスタグラム(nasa) - 5月7日 00時08分

Saturn's moon Titan! Titan's south polar vortex mimics the moon itself, creating an elegant crescent within a crescent. Situated above the surrounding polar atmosphere, the raised walls along the sunward side of the vortex just catch the grazing sunlight, creating a crescent of its own. Titan (3,200 miles, or 5,150 kilometers across) is Saturn's largest moon and possesses a dense and dynamic atmosphere. The image, obtained at a distance of approximately 108,000 miles (174,000 kilometers) from Titan, was taken with the Cassini spacecraft wide-angle camera on December 2013 using a spectral filter which preferentially admits wavelengths of near-infrared light centered at 939 nanometers.

Credit: NASA/JPL-Caltech/Space Science Institute

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