tl;dr-
Q: Why did Mars lose its atmosphere while Earth and Venus did not? A:
It's mass is much lower.
Apologies, I was oversimplifying in my statement about mass. Mass is
one component in the overall equation; solar winds blow the atmosphere
away, rotational velocity affects compression and mixing and imparts
magnetic shielding, albedo controls vaporization, and celestial events
like the formation of satellites contribute to or detract from
atmosphere. If you're going to build an atmosphere from scratch, you'd
probably choose a planet that tends to retain the fruit of your labor
rather than loses them.
Mars doesn't have a rotating iron core like the Earth does, you'd have
to make one (requiring mass). Mars doesn't have the water to create
oceans (maybe never did) to dominate the greenhouse effect you'd have
to make them (requiring mass). Mars has a smaller radius and an
analogous period of rotation to Earth, you'd either have to slow its
rotation (requiring mass) or increase its radius (requiring mass).
On Jan 31, 11:33 am, 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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