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These dark spots are distinctive because much of the surrounding area appears to be covered by light-toned dust. In pre-HiRISE images, the origin of this dark spot was ambiguous. This HiRISE image reveals that the dark color is likely the result of accumulations of basaltic sand (smooth, blue-colored material in the color swath) on top of otherwise relatively dust-free bedrock.
Originally posted by ElectroMagnetic Multivers
Edit to add: If this was water, I doubt NASA would leave it blue, they would hue it with red, so as to divert attention, the fact that it is blue makes me question.
Originally posted by jpm1602
To believe pockets still exist is not outside the realm of imagination.
Originally posted by Soylent Green Is People
reply to post by peacejet
I know it was proven that water ice exists on Mars, but water itself would sublimate away due to the low atmospheric pressures.
[edit on 9/27/2008 by Soylent Green Is People]
Note that the interior contents of these two depressions are a very light and very bright color. One might assume that this may be because of the presence of highly reflective ice conditions. Such an assumption would conveniently in turn enable the perception and following arguments that this ice is probably CO2 ice. However that just isn't the case here. Note that the flat level interior surface and the obvious narrow band of sloped bare shore between the true liquid waterline and the darker background shore as pointed out by my labeling are both very light color. In my opinion, this is because of an application of light color semitransparent (opaque) smudge image tampering was mapped and applied equally to both the bare sloped shore narrow band and the flat water surface together.
Now, if it had been applied thick enough in enough layers, the evidence of flat level liquid waterline as differentiated from the narrow band of sloped shore evidence would have been merged together and eliminated. That is typical of how effectively obscuring water sites goes in this planetary Mars imaging as it has been released to us. Fortunately for us liquid water depth because of its transparency absorbs more light than it reflects and is normally a darker color preserving the water here as a very slightly darker color and thereby the faintly seen waterline demarcation line effect is preserved. Also, the narrow band of reflective sloped shore as above water terrain was already a lighter reflective color in the natural sunlight. So the tampering application made it even lighter maintaining to some extent the contrast difference between the water and narrow band of sloped shore to preserve the irregular waterline demarcation line.
This type of tampering is typical of how the visuals of the natural visual qualities of liquid surface water are hidden from view in the Mars satellite science data imaging. I have seen a great many much more effective applications, especially around and on the South Polar Cap itself. Most of the time these applications are successful at merging the water and shore into a false single flattened visual effect intended to and relatively effectively mimicking an ice field, at least as it appears in the compromised quality distant satellite imaging as released to us. Remember, if it can be made to appear to be solid form ice, then it can in turn be argued that it is CO2 ice rather than water ice. At the very least, doubt is introduced and, when in doubt, who are you going to believe a lone individual like me or the whole scientific world?