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Thread: Mars's Redness

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    Question Mars's Redness



    The Earth went through a red phase when life began and bacteria and/or microbes removed and deposited iron. I've heard this several times over the years but not in relationship with Mars being red. Isn't Mars being red a BIG indicator that it had or has life?
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    Default Re: Mars's Redness

    https://en.m.wikipedia.org/wiki/Mars_surface_color

    There was a posting a couple of days ago about most of the asteroids and such showing red due to organic material (it may be in the Astro physics forum)
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    Default Re: Mars's Redness

    I always thought that the red tinge was iron oxide (rust).
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    Burris

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    Default Re: Mars's Redness

    Most rocky things in space are gray.
    When Earth went through its red phase it was because life produced oxygen and it ended up with iron oxide.
    I reside next to a small creek that people call a sulphur creek but I know that it is really iron precipitating out of the water from earlier mining in the area. I am also next to several mountains that have been cut away and you can see the different strata and the fossil layer is red.
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    Default Re: Mars's Redness

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    Default Re: Mars's Redness

    Tholins doesn't seem like what is on Mars or Earth.
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    Default Re: Mars's Redness

    They are not, the first link I posted about Mars states why it has a red tinge.
    The second article is about the red they are finding on asteroids and moons that have been imaged.
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    Default Re: Mars's Redness

    Iron oxides can form due to various non-living processes (the breakdown of water into oxygen plus hydrogen, or radiation interacting with carbon dioxide in the atmosphere, for example) and it doesn't require "free oxygen" from the microbes though. It's possible, but with our current knowledge, I think there is no way to prove that the oxygen used to create iron oxides on Mars came specifically from microbes.

    Looking for potential signs of the past life on Mars, I personally find the discovery of manganese oxides in Martian rocks much more interesting as based on what we know, the formation of these manganese oxides involves either high levels of atmospheric oxygen or microbes. That likely indicates strongly oxidizing conditions within a water-rich environment in Mars' past and could probably be considered a potential biosignature. I'm really looking forward to the upcoming part of the ExoMars mission by ESA as its primary focus will be looking for potential biomarkers in the underground samples.
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    Default Re: Mars's Redness

    Quote Originally Posted by mythos917 View Post
    Iron oxides can form due to various non-living processes (the breakdown of water into oxygen plus hydrogen, or radiation interacting with carbon dioxide in the atmosphere, for example) and it doesn't require "free oxygen" from the microbes though. It's possible, but with our current knowledge, I think there is no way to prove that the oxygen used to create iron oxides on Mars came specifically from microbes.
    If this is so why haven't thay said that as pertaining to the Earth?
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    Default Re: Mars's Redness

    Quote Originally Posted by seer View Post
    If this is so why haven't thay said that as pertaining to the Earth?
    I'd say most of iron oxidation on Earth is attributable to microbes because we have actual cyanobacteria fossil evidence that coincides with the time when most of the Banded Iron Formations were being deposited and the Great Oxygenation Event happened with a rapid buildup of free oxygen (a waste product of the said bacteria) in the atmosphere which accounts for more (and faster) oxidation than the one performed by other oxidizing agents such as water, carbon dioxide, carbon monoxide or other non-living sources before that.

 

 
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