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Tessera (Venus)
Tesserae are regions of heavily deformed terrain on Venus, characterized by two or more intersecting tectonic elements, high topography, and subsequent high radar backscatter. Tesserae often represent the oldest material at any given location and are among the most tectonically deformed terrains on Venus's surface. Diverse types of tessera terrain exist. It is not currently clear if this is due to a variety in the interactions of Venus's mantle with regional crustal or lithospheric stresses, or if these diverse terrains represent different locations in the timeline of crustal plateau formation and fall.〔 Multiple models of tessera formation exist and further extensive studies of Venus's surface are necessary to fully understand this complex terrain.
==Exploration==
Tesserae were first noticed in data from the Pioneer Venus Orbiter, as regions of anomalous radar properties indicating high topography. This was later investigated by the Venera 15 and Venera 16 orbiters. Through SAR imaging, it was discovered that these high topography regions with abnormally high backscatter represented intensely deformed terrain,〔 dubbed tesserae (Latin for "tile") due to its variety of patterns. The most recent data concerning tessera terrain comes from the Magellan Mission, in which the majority of Venus's surface was mapped in high resolution (~100 m/pixel).〔 Future missions to Venus will allow for further understanding of tessera terrain.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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