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question on the universe and life
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| jupiterone |
so we know life on earth took millions upon millions of years to develop.
would it rational to say that millions of years before life on earth had the ability to develop, mars/other planets in our system had the ability to house life (and/or did house life that we don't even know of?)
| quote: | TUCSON, Ariz. -- Laboratory tests aboard NASA's Phoenix Mars Lander have identified water in a soil sample. The lander's robotic arm delivered the sample Wednesday to an instrument that identifies vapors produced by the heating of samples.
"We have water," said William Boynton of the University of Arizona, lead scientist for the Thermal and Evolved-Gas Analyzer, or TEGA. "We've seen evidence for this water ice before in observations by the Mars Odyssey orbiter and in disappearing chunks observed by Phoenix last month, but this is the first time Martian water has been touched and tasted." |
is it possible to say mars could have been a planet that had similar (maybe not as developed) life as earth, but was wiped out by natural catastrophes similar to those earth experienced during the time of dinosaurs, maybe even more extreme? |
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| MrJiveBoJingles |
Sure.
Some even speculate about whether there could exist forms of life that don't require water.
:o |
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| adi_hanson |
yup very plausible .
Hamilton could of won there F 1 championship billions of years ago |
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| - T - |
it's likely it cooled faster (it's smaller), developed oceans first, could have had a complete evolution of life, then lost most of its magnetic field and the moisture drifted off into space.
so it could have been a fastrack evolution, compared to the earth, and died quicker too. so, if there was life, it's likely it didn't make it past plants/bacteria before everything died. |
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| Lomeli |
| Who's to say that all life forms need air and water to survive? I mean, on this planet it's essential, but it's very much possible that extraterrestrials have their own mechanism for survival in their own world. |
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| SuspicionVandit |
| I like to believe that before Venus went through its greenhouse effect, there was some life on there. All the buildings, entities and proof of their existence was eroded, burned and eradicated away into history. |
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| Project-K |
| quote: | Originally posted by Lomeli
Who's to say that all life forms need air and water to survive? I mean, on this planet it's essential, but it's very much possible that extraterrestrials have their own mechanism for survival in their own world. |
Water is kinda touchy because dehydration synthesis/hydrolisis are essential to the breaking down and reorganisation of organic compounds, though it's not totally impossible that in some far out environment some different mechanism would have occured, but lifeforms evolving from that wouldn't look remotely like anything we have on earth.
As for air, well old earth atmosphere had negligible oxygen content. Cyanobacteria thrived in that environment and used photosynthesis to produce energy, which also generates oxygen as a biproduct (thus allowing bacteria to later evolve aerobic respiration), so interrestingly enough, we have life on earth that doesn't require air. |
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| Chimney |
This is a rather complicated question since we have to define the base-understanding of what "life on another planets" means.
It is possible for organisms to travel between planets however that doesn't mean that certain life-form spawned ON that particular planet, this being one of the researches biologists have problems with.
If a meteor was to have hit earth 2 milion years ago it is possible that bacterias were went onto Mars. Bacterias can then shut themselves into spores, thus managing living on minimal resources.,
/feels like I went off-track here a bit ;)
Mars and other planets might have the possibility of hosting life, however this is a question which refers to the condition that the organisms on Mars needed to survive.
As we know right now most of the living things on the planet need water, energy and oxygen to survive, however on the depths of the oceans there are organisms known to live in symbyosis with other bacterias, hence managing to live by extracting nitrogen from the fissures at bottoms of the oceans.
The theory of life on Mars etc is credible...however for those life-forms to vanish without a trance, if an entirely different story. |
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| rT19 |
There is life out there!
oops LAG! double post ! LAG LAG LAG |
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| rT19 |
| There is life out there! |
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