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Oxygen & life

11/30/2021 12:50 AM

If oxygen on our planet is the production of vegetation and marine microbes to some extent in the greater part. where did the oxygen in water come from? Also, Mars had water at one time so it had oxygen so can we presume that Mars had plant life and possibly some other type of life?

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#1

Re: Oxygen & life

11/30/2021 1:03 AM

..."A feature of oxygen is that it is very often in association with other elements, as in the case of water (H2O), carbon dioxide (CO2) and iron oxide (Fe2O3). It also combines with numerous many other elements that comprise the earth's crust. It is thus a part of many of the other major global cycles. Most of the earth's total oxygen is stored in rocks and minerals (about 99 per cent) which form part of the lithosphere, the outer solid layer of the earth's crust. The next largest amount is to be found in the atmosphere and a tiny fraction, though of great importance, is in the biosphere."...

"In most rocks oxygen makes up about 92 per cent by volume; all cations taken together (silicon and metals) make up but 8 per cent by volume."

Rocks are almost all oxygen....yeah kinda weird...

The Martian atmosphere is about .02% oxygen, and like Earth it has a lot of oxygen stored in the rocks and soil...

https://www.nasa.gov/press-release/nasa-s-perseverance-mars-rover-extracts-first-oxygen-from-red-planet

..."To date, no proof of past or present life has been found on Mars. Cumulative evidence suggests that during the ancient Noachian time period, the surface environment of Mars had liquid water and may have been habitable for microorganisms, but habitable conditions do not necessarily indicate life."...

https://en.wikipedia.org/wiki/Life_on_Mars#:~:text=To%20date%2C%20no%20proof%20of,do%20not%20necessarily%20indicate%20life.

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#2
In reply to #1

Re: Oxygen & life

11/30/2021 1:19 AM

...."If Earth was born a hot and dry planet, the water must have arrived later, after the planet had cooled, presumably brought by icy comets and asteroids from far out in the solar system, which bombarded the young planet, seeding it with their water, some of which stayed on the surface and became our oceans, while the rest made it down into the mantle." ...Jan 12, 2021

https://theconversation.com/why-is-there-water-on-earth-153931

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#4
In reply to #2

Re: Oxygen & life

11/30/2021 4:06 AM

Mars mass is much less than Earth's, so the gravity is less, about 1/3 that of Earth's...this leads to loss of atmosphere as the gravity is not enough to hold gases very well to the planet....the atmospheric pressure therefore is much lower at 0.095 psi as compared to the Earth's sea level atmospheric pressure of 14.7 psi...So the only way to make it habitable would be to crash hundreds of asteroids into it to gain mass...then terraform the atmosphere...It would still take millions if not billions of years....

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#3

Re: Oxygen & life

11/30/2021 3:50 AM

Oxygen is made in stars by nuclear fusion. It is ejected from that process in supernovae.

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#5

Re: Oxygen & life

11/30/2021 7:20 AM

Well, oxygen is the third-most abundant element in the universe, forged in the superhot, superdense core of stars..

And it’s basically, IMO, where everything is (for a lack of a better word) ‘driven’ to creating, basically from the reaction oxygen has.

And as far as Mars is concerned, that question is still under investigation. Again, IMO, yes, at one point it did support life… as long as the Mars had a molten core of iron to protect the planet. When that was gone,… so did life.

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#6

Re: Oxygen & life

12/01/2021 2:36 AM

As you have noted, oxygen is produced by marine organisms, so that is where the vast majority of oxygen molecules in water come from. Other stretches of water acquire oxygen by diffusion from the atmosphere. It’s a slow process, but it works.

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#8
In reply to #6

Re: Oxygen & life

12/02/2021 4:05 PM

Garth & PHPH,

Don't confuse the different molecules in which we see oxygen. Oxygen as a gas is fairly capable of reacting with other elements and molecules, and indeed the most stable state is NOT in its gaseous O2 form. To get it in this molecular form you need the various microbes, plants, etc.

--JMM

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#7

Re: Oxygen & life

12/01/2021 12:37 PM

At one time it was assumed that oxygen in the atmosphere of an exoplanet was an indication of probable life, but it is now thought that atmospheric oxygen can be produced abiotically.

"However, non-biological chemical reactions can also affect atmospheric compositions of extrasolar planets. Now, the research team led by Dr. Narita has shown that abiotic oxygen produced by the photocatalytic reaction of titanium oxide, which is known to be abundant on the surfaces of terrestrial planets, meteorolites, and the moon in the solar system, cannot be discounted.

For a planet with an environment similar to the sun-Earth system, continuous photocatalytic reaction of titanium oxide on about 0.05 % of the planetary surface could produce the amount of oxygen found in the current Earth's atmosphere. In addition, the team estimated the amount of possible oxygen production for habitable planets around other types of host stars with various masses and temperatures.

They found that even in the least efficient production case of a low-temperature star, the photocatalytic reaction of the titanium oxide on about 3 percent of the planetary surface could maintain this level of atmospheric oxygen through abiotic processes. In other words, it is possible that a habitable extrasolar planet could maintain an atmosphere with Earth-like oxygen, even without organisms to perform photosynthesis."

https://exoplanets.nasa.gov/news/215/oxygen-on-exoplanets-isnt-proof-of-life/

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