Why was Xanadu Regio important to early studies of Titan’s surface?

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Titan Titan, moon of Saturn, photographed by Voyager 2 on August 25, 1981, at a distance of 907,000 km (564,000 miles). Green and violet images were combined to make this photograph, which shows the extended atmosphere of the satellite.

Xanadu Regio was significant to early studies of Titan because it provided the first evidence that the moon's surface was not uniform. In 1994, observations made in near-infrared wavelengths by the Hubble Space Telescope revealed this bright, continent-sized region on Titan’s leading face.1

Because Titan is obscured by a thick haze, scientists utilized the fact that this haze is partially transparent to near-infrared light to identify the feature. Xanadu Regio was subsequently confirmed through radar observations from Earth and the Cassini spacecraft, which could penetrate the atmospheric haze. Following these initial discoveries, the region served as a reference point for characterizing the moon's surface, as researchers identified other bright, rough terrains that shared similar properties to Xanadu Regio.1