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[ND] "Bullet-proof" evidence of past water found on Mars - Page 3

post #21 of 60
Quote:
Originally Posted by Arrehenius View Post

Long story short, they say Mars got hit by 15 large asteroids stripping it of its magnetic fields and the water vaporized into space when the planet was hit by all the solar winds without its defenses.
Thanks. smile.gif Will have to watch the vid another time though.
post #22 of 60
Quote:
Originally Posted by Arrehenius View Post

Long story short, they say Mars got hit by 15 large asteroids stripping it of its magnetic fields and the water vaporized into space when the planet was hit by all the solar winds without its defenses.

ummm... how could they determine this? has to be a theory only and not proven
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post #23 of 60
Quote:
Originally Posted by Tipless View Post

ummm... how could they determine this? has to be a theory only and not proven

A scientific theory would be something that has been proven btw. You mean hypothesis?
post #24 of 60
Quote:
Originally Posted by musashin View Post

I never thought this was really an area of contention. There are riverbeds, gullies, canyons even. Heck, there are even freaking ice caps!
Quote:
Originally Posted by Tipless View Post

i thought there were ice bergs on the poles of mars and was discovered in 1976:

Just because there is frozen water doesn't mean there was ever liquid water. Things like riverbeds imply a liquid, but not necessarily water. Liquid carbon dioxide, for example could have created those features on Mars when it was slightly warmer.
Quote:
Originally Posted by Tipless View Post

ummm... how could they determine this? has to be a theory only and not proven

There is a HUGE difference between a hypothesis (which this is) and a theory, which has tons of evidence in its favor and is generally regarded as true. "Prove" does not exist in the scientific community.

As to how they could determine this- in order to have liquid water, mars would have to have an atmosphere with enough greenhouse gases to trap heat. In order to have an atmosphere that thick, it would have to have a magnetosphere, created by the flow of liquid iron in its core. Accretion theory implies that all the rocky planets in our solar system have an iron core and some surface features and magnetism of the crust imply that Mars used to have a magnetic field like the Earth's. Over time, this has faded, due to the cooling of the core, allowing the solar wind to slough off the atmosphere.
    
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post #25 of 60
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Edited by aroc91 - 12/12/11 at 6:32pm
    
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post #26 of 60
Quote:
Originally Posted by aroc91 View Post

"Prove" does not exist in the scientific community.
Scientific theories are proven to be supported by observation. It's the best known understanding of reality.
post #27 of 60
Quote:
Originally Posted by aroc91 View Post

Just because there is frozen water doesn't mean there was ever liquid water. Things like riverbeds imply a liquid, but not necessarily water. Liquid carbon dioxide, for example could have created those features on Mars when it was slightly warmer.
There is a HUGE difference between a hypothesis (which this is) and a theory, which has tons of evidence in its favor and is generally regarded as true. "Prove" does not exist in the scientific community.
As to how they could determine this- in order to have liquid water, mars would have to have an atmosphere with enough greenhouse gases to trap heat. In order to have an atmosphere that thick, it would have to have a magnetosphere, created by the flow of liquid iron in its core. Accretion theory implies that all the rocky planets in our solar system have an iron core and some surface features and magnetism of the crust imply that Mars used to have a magnetic field like the Earth's. Over time, this has faded, due to the cooling of the core, allowing the solar wind to slough off the atmosphere.

liquid CO2 would take a lot of pressure...that is the biggest reason to believe that water made the erosion on Mars. The planet's size makes it very unlikely that it could have compressed an atmosphere enough to turn many gases into liquid besides water. Temperature has some effect on it, but not as much as pressure. Temp wise, Mars isn't drastically colder than earth; above freezing on the sunny side. We would consider it on the edge of the "habital zone"

But yeah that is what the common belief is on what happened on Mars. Really hasn't been anything found to think otherwise.
Edited by Vagrant Storm - 12/12/11 at 7:15pm
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post #28 of 60
Wait... what? We've had "bulletproof" evidence for years! Polar Ice caps, gullies, and for the love of all things, SNOW! Yes, SNOW! Ya know, that thing that hates all of us and makes people drive like circus monkeys? Yes, that!
post #29 of 60
Quote:
Originally Posted by XNine View Post

Wait... what? We've had "bulletproof" evidence for years! Polar Ice caps, gullies, and for the love of all things, SNOW! Yes, SNOW! Ya know, that thing that hates all of us and makes people drive like circus monkeys? Yes, that!

Yeah smile.gif
http___www.eurekalert.jpg

phoenix-lidar.png


There's even water on the south pole of the moon inside a giant crater.
Edited by PoopaScoopa - 12/12/11 at 7:34pm
post #30 of 60
[http://i.word.com/idictionary/theory]theory[/] theory has many definitions, several of which I used correctly. And guessing at how something happened based on certain facts is a theory. Thank you come again!
Edited by Tipless - 12/12/11 at 9:01pm
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