My guess is that the fragility you speak of would be true for most any life on any planet. And that is probably why it appears that we are alone in the universe. We, or any other remotely similar living beings elsewhere, would need to take a bubble of our atmosphere and everything else we need that we find in relative abundance on our home planet with us and keep that bubble functional for a long, long time in order to make it to another star system. There will be no water out there so all water would need to be recycled. That would mean extracting all water from feces and urine. One wonders at the process to pull that off. And all done within the confines of a ship that is not going to be all that large.

We know that stuff breaks, inevitably. Imagine one light year out the machine that dehydrates feces goes south the way the ice machine did on that boat in 'The Perfect Storm.' Spare parts? We used all of them the last two times it broke!

It's hard to find good planets. We need to take care of this one.

__________________
Te futueo et caballum tuum

1986 300SDL, 362K
1984 300D, 138K

Probably needs some kind of liquid, guessing on that.

Life existed here for hundreds of millions of years before the existance of atmospheric oxygen. When oxygen gradually began to be present in a big way there was a great die off of critters that did not groove well with it:

https://en.wikipedia.org/wiki/Great_Oxidation_Event

https://www.astrobio.net/news-exclusive/the-rise-of-oxygen/amp/

__________________
Te futueo et caballum tuum

1986 300SDL, 362K
1984 300D, 138K

It exists in fuel tanks from water, due to condensation.

Existed in some form of water first.

like the hydrocarbon sea's of titan.Nuclear reactors,hydrogensulphide,400f. black smokers.Life can be anywhere.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

It would be interesting on just how the earth acquired water originally. Or an atmosphere that allows it to recycle The water. Not a drop is really lost in the process I suspect.

In any event the enviroment did not adapt to us. We somehow adapted to it. Man in all likelihood will not determine how long he continues to exist here in any event.

Except if we get really stupid and that is a possibility. We already have enough really stupid practices in place.

Man even had to adopt to the various foods that are produced on the earth. Actually that they evolved as well is yet another amazing fact.

In the overall scheme of things that exist in the universe. If there is even a reason or scheme of things. Personally I think mans existence is inconsequential. In that if we exist or not makes not an iota of difference in the universe.

We may even be on a self inflicted race to self extinction. There appears to be natural evolution.Yet forces like radiations that we never evolved to cope with it seems. Yet we generate then in many ways now on the planet ourselves as well as the natural occurring ones.

https://www.smithsonianmag.com/science-nature/how-did-water-come-to-earth-72037248/

Barry one thought is oxygen which the sun has,and hydrogen bombed with gamma rays, produce the rains that fell for a billion years,and comets

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

Did I assert otherwise? I spoke to the abense of atmospheric oxygen.

__________________
Te futueo et caballum tuum

1986 300SDL, 362K
1984 300D, 138K

Not only acquried water but retained it. The belief is that the water (vapor) on Mars was driven off by solar wind after its molten core cooled and solidified, ending the magnetic field. Which is the main reason that the pipe dreams about terraforming Mars for human habitation are doomed to failure. No atmosphere is going to remain long on Mars without a magnetic field. Not to mention UV rays, unblocked by a magnetic field, would cause major grief for humans and any other life form. Mars is a dead rock. I urge Musk to go live (and die) there.

__________________
Te futueo et caballum tuum

1986 300SDL, 362K
1984 300D, 138K

My take from the Smithstonian article. They are far from certain of just what transpired. Perhaps we can ask one of our really older esteemed Members.Since they were possibly present when it arrived?

For a youngster like myself I will go with somebody left a tap on.

I have heard claims that Mars may have had water at one time. I just do not know if that has really been proven.

The nice thing about the universe is you can speculate and nobody can say you are categorically wrong.

The wife must have had an interest in the universe at one time. As she mentioned she wanted to see stars. So I installed skylights on the upstairs bedrooms of the cottage. As for myself I still find it somewhat humbling to watch the night sky on a really clear night.

There apparently is evidence of a force in the universe they cannot identify. Apparently there is enough evidence it exists. A lot of answers might come forward if it is ever identified. It is probably very complex as they are having no luck at identification. Only observing the effects it produces. Dark matter?

A couple of our daughters unlike their father are really smart. One attending Sunday school after some exposure . Asked if god really created the universe. Where exactly did he do this from? To her even at age five it was just a logical question. Now even at fifty she still suprises us as parents.