The large circular object in the center of the image is Titan....

The large circular object in the center of the image is Titan. The dark spot in the center is the main solid part of the moon. The bright surrounding ring is atmospheric haze, sunlight scattering gas. Credit:NASA, ESA, JPL, SSI, Cassini Imaging Team. via /r/spaceporn http://bit.ly/2YctOfr

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