The above NASA image shows cloud cover on Mars as seen by the Hubble Telescope in 1998. The colours and cloud activity are much more dynamic than in recent washed out orbital pictures.
If you examine amateur pictures of Mars taken from ground based telescopes you can see that the colours match closely to the Hubble image from 98 rather than to any of the recent NASA pictures. One is left to consider that recent official pictures have been altered:
While NASA does admit there is a Martian atmosphere it is likely much thicker than has been admitted.
The evidence for such a position comes from the daytime pictures taken from the surface that DO NOT show a black sky, which is what you should get on low dust days. We are shown dust-haze free orbital pics, and yet no black sky pictures - which is what you get on Earth at 80,000+ feet where our atmosphere is the same density as allegedly on Mars.
Instead of black skies we see orange and grey-blue skies, the latter feature indicative of a much thicker atmosphere. If there is a LOT of dust the sky would be orange-red. However, if dust levels were low, then behind the orange should be black sky during the daytime if the atmosphere is really as thin as we've been told. You never see that.
And when we consider the existence of life forms, consider that the temperatures on Mars vary.
At the equator, in direct sunlight, it has been admitted that temperature can rise to more than 23 degrees Celsius - enough for water to remain liquid if there is enough air pressure.
Is there life on Mars? Plants? Fungus? Bugs? Worms? Probably yes considering that we have clear evidence of a cover-up. Regardless of the life question, it certainly seems there is more going on with the atmosphere that officially explained when you logically consider the image data that has been made available.
The Martian Atmosphere must be thicker than we've been told
[Posted at the SpookyWeather blog, March 12th, 2016.]