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Show ALL Forums  > Science/philosophy  > Life on Other Planets? YES????      Home login  
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 shakeitupbaby2012
Joined: 8/12/2010
Msg: 94
Life on Other Planets? YES????Page 5 of 6    (1, 2, 3, 4, 5, 6)
Sulfur compounds serve as both fuels and respiratory (oxygen-replacing) materials for simple organisms.
It's an interesting find. In order to exist on other planets those elemental and environmental conditions would need to exist.
It does lend to other forms of life being in existence.
 Page 2u
Joined: 1/30/2008
Msg: 95
Life on Other Planets? YES????
Posted: 6/18/2011 7:48:27 PM
I think its not so much a chemical mixture—ie. Sulfur compounds--(oxygen-replacing)
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.

therefore---imo-- its very likely that, life will be everywhere.
 FrogO_Oeyes
Joined: 8/21/2005
Msg: 96
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Life on Other Planets? YES????
Posted: 6/18/2011 9:09:54 PM
There are two issues being conflated here. The first is "where can life arise?" The second is "where can life survive or thrive?" From what we observe here on Earth, life can persist in amazingly difficult environments. However, the majority of life appears to not only exist within a relatively narrow range of conditions, but have internal chemical processes related strongly to those conditions. That is, life may be constrained in its origins to environments with moderate conditions, certain chemical and energy resources, and liquid water. Those conditions do not seem to be ubiquitous in the known universe, so I doubt that life is all that widespread. Mars may have harbored suitable conditions long enough for life to arise, and the current conditions may not be harsh enough to have wiped it out. Venus, however, may never have given life a chance to arise, much less adapt to the conditions which are now beyond extreme everywhere on the planet. At least on Earth and Mars, there are gradients of conditions which give life refuge or opportunity at the edge of tolerance before pioneering the truly extreme conditions.
 aremeself
Joined: 12/31/2008
Msg: 97
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Life on Other Planets? YES????
Posted: 7/2/2011 10:14:35 PM
before we get all gijitty about life on other planets, we should maybe have a clue on how life starts, beyond our fantasies, that is.
 jessehoo
Joined: 12/21/2009
Msg: 98
Life on Other Planets? YES????
Posted: 7/8/2011 5:44:10 PM
That there be life on another planet is not really profound.

Is life limited to cells or cell liek structures? does anyone know? When did the cell become alive? Is it only alive if it replicates? Whaat? Are pre-replication molecules not alive?
 Jiperly
Joined: 8/30/2006
Msg: 99
Life on Other Planets? YES????
Posted: 7/9/2011 8:23:38 PM
No, but non-replicating molecules will disappear within a "generation"
 swamp_dude
Joined: 7/23/2007
Msg: 100
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Life on Other Planets? YES????
Posted: 7/10/2011 8:01:21 AM
We may very well find evidence of life in other parts of our solar system due to evidence of water ... life and water seem to be symbiotic.

hence we are searching for evidence of water in other solar systems .... we have only begun with Keplar to be able to detect planets that may be the right size and in an adequate position to maintain water and therefor may have life.

I do believe we will discover that its more abundant than we first thought ... but we still have a isolated via distance problem in interaction of life .... though basic amino acids have been discovered in asteroid/comet investigation ... so ... life may have come to the earth from space. .... though in another sense it did .... because the earth itself formed from particles from space.
 AdamM12345
Joined: 6/10/2010
Msg: 101
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Life on Other Planets? YES????
Posted: 7/10/2011 9:37:32 PM

Seriously, the "The Universe is Big, so life must exist out there" belief has to be one of the most halfassed beliefs ever- theres zero evidence to support it!

The Ocean is huge- nearly 3/4 of our planet is underwater- does that mean that since the Ocean is so huge that there must be mermaids down there? But since the universe is huge, thats proof of life??


You have gone on and on about people being irrational and jumping to conclusions for the possibility of life on other planets in the universe. Everyone's excepting unfounded mathematics and how we don't know what the conditions for life are.

If I am reading this article correctly, it seems to be saying that the conditions for life are not as restricted as previous theories set forth. I hope we can agree that it is at least possible for life to exist on another planet within the universe. I am not saying that it does only that its possible. So if it is possible then we should think about how probable it is. This article seems to state that is more probable then what we understood yesterday. Like how we use to think the Earth was flat and the center of the universe.

Is the only way you would except life on other planets on other planets is physical proof? Lets say that in the future we find microscopic life forms use to live on Mars or maybe still do. Would it then still be to big of a jump to conclusions about intelligent life? What if we find something as intelligent as dog on Titan?

Is it as big of a jump as saying life exist out there because there so much as say jumping to mythological creatures living in the biggest area known to support life.

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.
 abelian
Joined: 1/12/2008
Msg: 102
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: 103
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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: 104
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: 105
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.
 Appreciative9809
Joined: 9/8/2009
Msg: 106
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Life on Other Planets? YES????
Posted: 7/22/2011 9:01:24 AM

Animate is anything that's alive. Inanimate is anything that is not alive. Pretty simple, really.


No, not really as simple as you think. Defining "animate" as "alive", merely postpones things. Because then there's the question of which bit of matter you regard as alive.

Is a virus alive? A prion?


I don't think anyone (apart from some religious fundamentalists) believes that earth holds the only life in the universe. There are trillions of galaxies out there. It's unlikely that earth is the only place life exists.


Some time ago I saw an article that said that the evidence has begun to accumulate to suggest that the universe is spatially infinite. Of course the article didn't say that it was certain. If the universe is infinite, then it would be pretty much a sure thing that there's life elsewhere.

But, with only one lifebearing planet known, and with a number of biologists emphasizing the extreme improbabililty of life (some biologists and astronomers used to say that there's most likely no other life in the obsersvable universe), I suggest that most likely, even if the universe is infinite, the nearest other lifebearing planet is so far away that communication or travel is out of the question, without science-fictionish spacewarp technology, or maybe even with it. I don't suppose that can be ruled out--Clarke said that sufficiently advanced technology is indistinguishable from magic. But, unless we or someone else devises such fantastic transport or communication, we're not going to hear from or meet anyone else, and probably won't even find any other life of any kind.

Most likely, life is so improbable that it's most likely to occur in a universe where that improbable event happened only once.
 swamp_dude
Joined: 7/23/2007
Msg: 107
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Life on Other Planets? YES????
Posted: 7/22/2011 11:07:05 AM
^^^^^ boing .[ back to reality]..... again .... as stated on the top of this page [message ... life 101] and in the OP ..... this is not about contact with life .... and the UFO thing .... this is about bacteria and building blocks of life ....
 stargazer1000
Joined: 1/16/2008
Msg: 108
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.
 CheshireCatalyst
Joined: 9/14/2007
Msg: 109
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Posted: 7/22/2011 7:34:59 PM
Strictly speaking, viruses are not alive, at least when you consider that the characteristics of biological life are the use of energy, evidence of growth, reproduction, homeostatis, and the presence of cells. To be alive, it is accepted that you must have a true cell and be constituted of cells. Viruses don’t have cells. They have a small number of genes, but not enough to allow them to grow, divide, expel waste, or defend against hot/cold. They also don’t carry their own repair enzymes that can fix errors. They are very sloppy about copying their DNA so if they were composed of thousands of genes, they'd be quickly wiped out.

Viruses don’t have enough genes that can do anything beyond make new viruses, so they're generally not considered to be alive.
 stargazer1000
Joined: 1/16/2008
Msg: 110
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?"
 CheshireCatalyst
Joined: 9/14/2007
Msg: 111
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Life on Other Planets? YES????
Posted: 7/22/2011 9:52:02 PM
Viruses are definitely biological and have their own taxonomy, and they share characteristics with parasites that use host cells to reproduce their genomes. They just don't fit well with the definition of a living organism.

By comparison, I'd say that a non-biological virus would be something that infects your PC.
 Hibernian1960
Joined: 9/13/2008
Msg: 112
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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: 113
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: 114
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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.
 swamp_dude
Joined: 7/23/2007
Msg: 115
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Life on Other Planets? YES????
Posted: 8/3/2011 10:02:52 PM
friendly .... lol .... why would anyone think other life would be friendly ... when most other life is just surviving in a reproductive/consumption cycle that pays little heed to anything outside of that cycle.
 swamp_dude
Joined: 7/23/2007
Msg: 116
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Life on Other Planets? YES????
Posted: 8/4/2011 8:14:25 AM
Oh ... Hollywood ... I'm prone to thinking this Alien abduction thing is no different than ...Trolls living under bridges and stealing children ... just fits our modern times better.

Got to admit, the cattle mutilation stories are pretty bizarre though and I'm really not that sure what to make of it. ... Cults, Military, Alien, Dimensional? or Insurance fraud.
 Earthpuppy
Joined: 2/9/2008
Msg: 117
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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: 118
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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