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Show ALL Forums  > Science/philosophy  > Life on Other Planets? YES????      Home login  
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 Jiperly
Joined: 8/30/2006
Msg: 81
Life on Other Planets? YES????Page 6 of 6    (1, 2, 3, 4, 5, 6)
No, but non-replicating molecules will disappear within a "generation"
 abelian
Joined: 1/12/2008
Msg: 82
Life on Other Planets? YES????
Posted: 7/12/2011 2:26:36 AM
Its more of a degree of complexity. –no matter what the aggregate is composed of
it can reach a state of complexity that, we would identify as--- life.

That isn't true. Carbon is unique. You can make more organic compounds (those containing carbon) than you can compounds from all other elements put together without carbon. (at least a factor of 10, perhaps a factor of 100). If you restrict the definition of organic to those containing hydrogen, there are still a factor of 10 or 100 more organic compounds than inorganic compounds. Carbon's outer electron structure allows carbon to form long chains and rings in complex geometries that no other element can, so life is carbon based. The element Si (and other group 14 elements) has an outer electron structure that most closely resembles carbon. However, the resemblence is not close enough, in that even Si, which is most like C, does not form long chain molecules. Basically, life is constrained by the conditions under which carbon compounds can exist as sufficiently complex and stable molecules.

Other constraints involve the necessity of a liquid to that would serve the same purpose water serves on earth - the transport of organic compound inside a living organism and in which living organisms can form. There aren't many to choose from. Water has the property that it's denser as a liquid than as a solid. i.e., ice floats. If that weren't the case, the oceans would be frozen from the bottom up. Ice that formed on the surface would sink as it freezes on the surface in winter, but the heat from the sun wouldn't thaw much of the surface, just like it doesn't at the poles.

For me, we are the proof that the universe supports life and it is way to big of jump to say that there is no way it exists anywhere else.

I don't think anyone (apart from some religious fundamentalists) believes that earth holds the only life in the universe. On the other hand, there are probably many fewer planets capable of supporting life than planets that can't support life. There are trillions of galaxies out there. It's unlikely that earth is the only place life exists.
 Earthpuppy
Joined: 2/9/2008
Msg: 83
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Life on Other Planets? YES????
Posted: 7/12/2011 5:17:39 PM
Intelligent life is another matter. We obviously failed to attain that state here where we used up all the resources, went broke, barely made it to our moon and back, are wiping out 25% of land based lifeforms/biodiversity in a short spurt of arrogance, and cannot even govern ourselves on this blue ball without the threat of wars and technology that can sterilize this planet. There is so much space junk now in orbit that it serves as a Bozone Layer, protecting the universe from the known harmful effects of humans.

Beam us up Scotty...no signs of intelligence here!
 jessehoo
Joined: 12/21/2009
Msg: 84
Life on Other Planets? YES????
Posted: 7/12/2011 7:37:08 PM

No, but non-replicating molecules will disappear within a "generation"


Yes, obviously, but the distinguishment between animate and inanimate things is largely a matter of perspective. It sort of starts to disapear the smaller and smaller, you go until you reach mere atoms. Not trying to be reductionistic, just saying BASICIALLY......the entire universe is alive.!!. !. 11.1!!!>!>1!.1!1.1.1!>!!!!!
 stargazer1000
Joined: 1/16/2008
Msg: 85
Life on Other Planets? YES????
Posted: 7/22/2011 7:05:08 AM

Yes, obviously, but the distinguishment between animate and inanimate things is largely a matter of perspective.


No, it's a matter of definition. Animate is anything that's alive. Inanimate is anything that is not alive. Pretty simple, really.


It sort of starts to disapear the smaller and smaller, you go until you reach mere atoms.


Then electron/neutrons/protons then quarks...

Everything on the macro scale (including life) is made of these particles but that doesn't mean these particles are alive, no more than, because houses are made of bricks, every brick is a house.


Not trying to be reductionistic, just saying BASICIALLY......the entire universe is alive.


Not trying to be reductionist, just trying to shoe horn a "new agey" explanation that is not justified.
 stargazer1000
Joined: 1/16/2008
Msg: 86
Life on Other Planets? YES????
Posted: 7/22/2011 6:54:43 PM

Is a virus alive? A prion?


Well, I'm not a biologist so I only have an enthusiastic amateur's level of learning to go with.

Prions, I don't have nearly enough information to offer a remotely informed opinion, so I won't address it.

Viruses, however, are interesting. They are made of RNA. They are mobile. They reproduce, albeit by taking over the normal functioning of a cell. They consume resources. They are subject to natural selection. Sounds "alive" to me.
 stargazer1000
Joined: 1/16/2008
Msg: 87
Life on Other Planets? YES????
Posted: 7/22/2011 8:48:00 PM

Viruses don’t have enough genes that can do anything beyond make new viruses, so they're generally not considered to be alive.


Does "biological" work as a definition, versus "non-biological?"
 Hibernian1960
Joined: 9/13/2008
Msg: 88
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Life on Other Planets? YES????
Posted: 7/25/2011 3:55:03 AM
Life as we know it.

Prokaryotic, eukaryotic, exhibiting bilateral symmetry or radial symmetry, reproducing sexually and/or asexually...Covers a lot, doesn't it?
 DevinRD
Joined: 6/23/2011
Msg: 89
Life on Other Planets? YES????
Posted: 8/2/2011 2:46:21 AM
Isn't it a mathematical certainty that life exists on other planets?

I think the only feasible defense for a theory that life exists on Earth alone and no where else in the UNIVERSE would HAVE to be based on religion particularly creationism.

"God made us on Earth and didn't make anyone else on any other planet."

For anyone and everyone, religious or not who believes that life evolved naturally rather than being placed here literally by the hand of God, I think it goes without saying that its impossible for there NOT to be life that evolved naturally on many other planets throuought the universe.
 Earthpuppy
Joined: 2/9/2008
Msg: 90
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Life on Other Planets? YES????
Posted: 8/2/2011 4:26:46 AM
Even the gods have their home planets. This was probably a vacation planet for them, us being the ants they could screw with during a picnic.
 Earthpuppy
Joined: 2/9/2008
Msg: 91
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Life on Other Planets? YES????
Posted: 8/4/2011 6:13:05 PM
One need only look at how humans treat their own planetmates to extrapolate how other species would view us in context. The slaughter of dolphins, whales, elephants, other bipeds,fellow mammels, amphibians, pollinators, and all sorts of interdependent species, shows that we are not truly from this place that give us life, allows us to continue to thrive and survive, and the failure to link that we are inter-dependent on thousands to millions of of other earthlings to be allowed to live on this rare blue ball of life in a big and expanding universe. We ignore the canaries in the coal mine of our brief existence at our own peril.
 R_O_U_S
Joined: 3/20/2011
Msg: 92
Life on Other Planets? YES????
Posted: 8/10/2011 7:26:48 PM
as life developed from blue green algea X _Y_Y its been published as more of the question as to where did it come from... if the nitrogen froze from planet x and a rock having grater mass took years to hit from planet x causing the divergency between X_Y in mitochodric similaities in what alien system was this first established and what chatasrophe brought galaxy x to an end. Probably a collapse of a sun or supernovae nearby in the milkyway.. its prbably happening relitivity (X) quantumly hidden in a wide scale in dark matter. i opine lol.
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