Venus probably once had liquid oceans for some (or maybe more) million
years.
But all the water was split into hydrogen and oxygen. Hydrogen
escaped into space - Venus is dead... Even if you could cool Venus
down 450°C (to make temperatures +25°C), there was no water at all, so
you could build permanent bases up there, but it won't ever be like
Earth with rivers and seas again.
As Cathal said, you need a gradient. Maybe the solid surface is a bit
cooler than the air?
Recently a new geological model for Venus was developed:
Voltailes as water (just a few 0.01 weight percent) make rocks melt at
lower temperatures. So tectonics developed at the Earth.
Venus had left nearly all its water. So the crust was thicker and no
heat could escape. Then after some time, a global eruption set free
large amounts of heat and gases.
Such eruptions occur every (I think to remember) 100 Millions of
years.
Yet this form of heat transport makes Venus lose much more of it's
core heat a study has shown. So Venus' core is likely to cold to
produce a magnetic field.
On 31 Jan., 18:33, Mega <masterstorm...@gmail.com> wrote:
> "Once the size is large enough to hold 1 Atm of air pressure at
> ground level you could feasibly start unlocking oxides in the soil to
> make it livable"
>
> Why that? Who says Mars can not hold 1 bar? Venus is Earth sized and
> holds 90 bars!!
> So Mars' Mass = 1/10 Venus' Mass => Atmosphere = 90/10 = 9 bar.
>
> On 31 Jan., 17:40, mad_casual <ademloo...@gmail.com> wrote:
>
>
>
>
>
>
>
> > Venus is a much more desirable candidate for many reasons:
> > Mass- Mars isn't big enough to support an atmosphere fit for human
> > habitation. You could float habitats on Venus' atmosphere.
> > Productive Energy (thermal and non-ionizing radiation)- Mars' surface
> > is relatively devoid of non-destructive energy. Venus has too much,
> > even simple heat pumps would effectively convert atmospheric energy to
> > other forms.
> > Destructive Energy (ionizing radiation)- Mars is awash in it. Venus'
> > atmosphere has a magnetosphere that affords a level of shielding.
> > Chemistry- Mars has lower water, carbon, and nitrogen in any form on
> > its surface or in its atmosphere than Earth. Venus has more of all of
> > the above, typically boiled in acid and at 90 atm of pressure such
> > that they are unusable to biological systems.
> > Value- Fixing Venus teaches us lots about "fixing" Earth. Fixing Venus
> > will be all about collecting energy rather than just expending it.
>
> > IMO, put an outpost on the Moon, colonize Mars, terraform Venus.
> > Anything else is making a purse out of a pig's ear. On that note; the
> > human body is supremely adapted to this planet and for relatively
> > short periods of time at that. Bending atmospheres to fit our lungs,
> > putting chairs in spacecraft to fit our rear ends, and blasting
> > surgeons and/or medicine around the Solar System is, to me, somewhere
> > between naive fantasy and religion.
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