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The Wave of Darkening on Mars

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dgs
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The Wave of Darkening on Mars

The Victorian observers often recorded a wave of darkening in the Pandorae Fretum or a "greening" of Mars as the seasons progress. Is this an effect we still see today? The reason I ask, is that I seem to have to tone down the green channel I'm currently picking up on Mars! I feel fairly certain it's not due to vegetation!

David