Frost inside "Snow-White" - Sol 144 (False Colors, according to NASA)

Caption NASA:"The Surface Stereo Imager (SSI) on NASA's Phoenix Mars Lander took this shadow-enhanced false color image of the "Snow White" trench, on the eastern end of Phoenix's digging area.
The image was taken on Sol 144, or the 144th day of the mission, Oct. 20, 2008.
Temperatures measured on Sol 151, the last day weather data were received, showed overnight lows of minus128 Fahrenheit (-89° Celsius) and day time highs in the minus 50 F (-46° C) range.
The last communication from the Spacecraft came on Nov. 2, 2008".