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Originally posted by bigfatfurrytexan
It would seem to me that the biggest barrier to terraforming is the lack of a magnetosphere. This is a most valuable asset for a life bearing planet to have. It protects you from radiation and coronal ejections.
Perhaps this is what prevents the oceans from flowing? Maybe that is another big question: why are the oceans locked up in the crust?
Too many variables....but it seems that the magnetosphere is a deal breaker.
Originally posted by blue bird
We have Venus - no magnetosphere but thick atmosphere. Than forming thicker atmosphere on Mars can provide radiation protection ( and stripping off formed atmosphere) from solar wind.
There are suggestions to build artificial magnetosphere: a grid of huge electromagnets on surface.
However, recent scientific evidence suggest that just a thick enough atmosphere like Earth's is enough to create a shielding effect in the absence of a magnetosphere. In the past, Earth regularly had periods where the magnetosphere changed direction and collapsed for some time. Some scientists believe that in the ionosphere, a magnetic shielding was created almost instantly after the magnetosphere collapsed.[3], a principle that applies to Venus as well and would also be the case in every other planet or moon with a large enough atmosphere.
*It is also interesting that on Southern hemisphere ( 'dark spots' or 'vegetation' ) stronger magnetic field is found.
ESA’s Mars Express spacecraft has for the first time ever detected an aurora on Mars. This aurora is of a type never before seen in the Solar System.
While the detected emission is typical for daytime, it must indicate the excitation of the upper atmosphere by fluxes of charged particles – probably electrons – if observed during night-time.
By analysing the map of crustal magnetic anomalies compiled with Mars Global Surveyor’s data, scientists observed that the region of the emissions corresponds to the area where the strongest magnetic field is localised. This correlation indicates that the origin of the light emission actually is a flux of electrons moving along the crust magnetic lines and exciting the upper atmosphere of Mars.
The strongest magnetic anomalies, according to the MGS data, are related to Terra Cimmeria and Sirenum in the heavily cratered uplands of Mars' southern hemisphere. The anomalies or fields are nearly as strong at the surface as the Earth's magnetic field, and are laid out in east-west bands of alternating polarity, extending for more than 620 miles [1,000 kilometers] north to south, sort of like a barcode across the planet's surface.
While the detected emission is apparently pretty typical for daytime, if observed during nighttime it must indicate the excitation of the upper atmosphere by fluxes of charged particles -- probably electrons. Therefore, the correlation indicates that the origin of the light emission is probably the result of a flux of electrons moving along the crust magnetic lines and exciting the upper atmosphere of Mars.
Originally posted by earth2
Question on those green pics above.
Did you change the colors on those pictures because when I followed your link they were grey.
Originally posted by earth2
Question on those green pics above.
Did you change the colors on those pictures because when I followed your link they were grey.
Originally posted by blue bird
“Defrosting“ south polar terrain ... look like thick, lush vegetation/forest to me....
msss
The first picture looks so much like foilage I might just go postal now. Also notice the clearing in the upper right hand corner, the circle patch with no trees in it.
Originally posted by Soraia
I know, I know...but if I weren't like this, I wouldn't be on ATS, now would I?
Like I said, I know, I know...the idea just popped up, and I felt the urge to post it. Might be a brain fart, might not be. The swirls even go in the same direction, in my eyes anyways.
zeeon, and everyone in that direction...I really don't need an in-depth comment. Just have fun with this, it's called "playing". You know, what we used to do as kids, when we used our imaginations?
The image generated by Pelletier’s computer simulations shows patterns like those of Mars’ spiral troughs, right down to the imperfections. Courtesy of Jon Pelletier
Yes, even I can see it.
Originally posted by blue bird
* Indeed ArMaP - there is no doubt that liquid was streaming downfall ...
Originally posted by pleyades
Kind'a makes you wonder why they sent a probbe to the dessert terrain instead of to the water soucers..