"This type of behavior distinguishes real variations in surface brightness from mere lighting effects, " the NEAR mission team said in a statement.

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This light is proportional to the surface temperature, so by measuring its brightness a microprocessor can compute the temperature.

FORBES: Body temperature.

Winner: Surface RT, based on quality of display, not brightness.

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On our standard Windows battery rundown test, in which we fix the display brightness and loop a video endlessly to exhaustion, the Surface Pro scored just three hours and 46 minutes, despite having a 42.5Wh battery a third larger than the 31.5Wh pack in the Surface RT.

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V4, where the light reflected from a surface is compared with that reflected from surrounding surfaces, in order to control for relative rather than absolute brightness.

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