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Temperatures on Phobos

The Mars Global Surveyor Thermal Emission Spectrometer (TES) measured the brightness of thermal radiation at the same time the camera acquired this image of Phobos. This preliminary analysis shows that the surface temperature, dependent on slope and particle size, varies from a high of +25 F (-4 C) on the most illuminated slopes to -170 F (-112 C) in shadows. This large difference, and the fact that such differences can be found in close proximity, adds support to the notion that the surface of Phobos is covered by very small particles.

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