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Intro music.

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The Cassini-Huygens spacecraft completes a second pass over Titan in preparation for a January touchdown.

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In a move for the future, the Cassini-Huygens spacecraft is starting to fine-tune for landing as it draws closer to the moon Titan.

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Almost grazing its atmosphere, the spacecraft just completed the closest pass ever over the moon.

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Cassini came within a slim 745 miles of the surface of Titan, Saturn's largest satellite.

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The latest over-flight is the second of three passes the spacecraft is making to refine its final approach for landing in January.

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Following the flyby, Cassini began transmitting the nearly 500 images taken with its normal light and infrared mapping cameras.

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Visible in the images are the moon's dense gaseous cloud cover and distinct surface features.

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The close approach is part of the spacecraft's preparations for releasing the Huygens probe into Titan's murky atmosphere.

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Made up of methane and other gases, Titan is our solar system's only moon with an atmosphere.

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After touchdown, the Huygens probe will analyze the moon's mysterious surface.

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Scientists suspect frozen in Titan's icy terrain may be organic compounds- the very same chemicals that led to the genesis of life here on Earth.

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