A water ocean on Titan?
May 5, 2011 By Charles Q. Choi
This artist's illustration shows the likely interior structure of Saturn's moon Titan. The cool and sluggish interior failed to separate into completely differentiated layers of ice and rock. In addition to the hazy surface of Titan (yellow), the layers in the cutaway show an ice layer starting near the surface (light gray), an internal ocean (blue), another layer of ice (light gray) and the mix of rock and ice in the interior (dark gray). In the background are the Cassini spacecraft and Saturn, not to scale. Credit: NASA/JPL
Oddities in the rotation of Saturn's largest moon Titan might add to growing evidence that it harbors an underground ocean, researchers suggest.
Titan, which is larger than Mercury, is the only world besides Earth known to have liquid on its surface. Its seas, made of liquid methane instead of water, have often led to speculation as to whether or not they could host life.
In addition to its seas on its surface, scientists recently also discovered hints that Titan possesses an internal ocean, one of water and ammonia. Using radar to peer through Titan's dense atmosphere, NASA's Cassini spacecraft found that over time, a number of prominent surface features had shifted from their expected positions by up to 19 miles (30 kilometers), showing that the crust was moving and suggesting that it rested on liquid.
Now Cassini's gravity and radar observations of Titan have discovered more clues that it might have an underground sea.
Titan apparently has an orbit very similar to our moon's for instance, it always presents the same face toward its planet.
However, they noted that Titan's axis of rotation was tilted by about 0.3 degrees. This tilt, or obliquity, seems high, given the estimate of Titan's moment of inertia, or its resistance to changes to its rotation.
One implausible reason for these findings is that Titan is a solid body that is denser near the surface than at its center. "This is in contradiction with all we know about others planets and satellites and planetary formation processes," said researcher Rose-Marie Baland, a planetary scientist at the Royal Observatory of Belgium in Brussels.
Another more likely explanation is that Titan is not solid all the way through, but has an icy shell overlying a liquid water ocean, an icy mantle and an icy, rocky core. The research team's models can give a wide range of thicknesses for the liquid ocean, anywhere from three to 265 miles (five to 425 km), as well as for the icy shell, anywhere from 90 to 125 miles (150 to 200 km).
The surface of Titan has some of the largest bodies of liquid ever seen. However, these lakes are composed of hydrocarbons. Scientists believe that oceans of liquid water and ammonia may be contained beneath the surface of the moon. Credit: NASA/JPL
"We found it very exciting to use some measurements that seem in contradiction and to try to reconcile them," Baland said. "It was like putting together pieces of a puzzle."Still, the case for Titan having an underground ocean is not closed yet. Its orbit and rotation might also be explained by a recent disturbance, such as a collision with a comet or asteroid.
"Our analysis strengthens the possibility that Titan has a subsurface ocean, but it does not prove it undoubtedly," Baland told Astrobiology Magazine. "So there is still work to do."
Since life as we know it needs liquid water, if Titan does have a subsurface water ocean that may increase the chances the moon could harbor alien life.
In the future, Baland noted that she and her colleagues would like to use this method to analyze Jupiter's four largest satellites, the Galilean moons Io, Europa, Ganymede and Callisto.
"The measurement of the obliquity of Europe or Ganymede could bring additional evidence for subsurface liquid layers," Baland said.
More information: Baland and her colleagues will detail their findings in a forthcoming issue of the journal Astronomy & Astrophysics.
Source:
Astrobio.net
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May 05, 2011
Rank: 4.6 / 5 (14)
Your logic is full of holes, your numbers are wrong.
Yes humans have never documented witnessing life arising from non-life. This does not mean that within the LONG history of the planet that it has never happened.
Kevinrtrs - Just wondering if you would mind answering a few questions, about your beliefs, i have?
May 05, 2011
Rank: 3.1 / 5 (13)
May 05, 2011
Rank: 4.2 / 5 (13)
May 05, 2011
Rank: 3.5 / 5 (4)
Just so long as they don't consult with BP or Halliburton, we have plenty of oil companies with expertise to offer.
May 05, 2011
Rank: 4.8 / 5 (5)
Quote:
Whereas the original images (except for a few pairs obtained at similar orbital phase, some of which we have mapped previously) were offset by as much as 30 km, the new versions align much better. The remaining misalignments, typically <1 km, can be removed by a least-squares adjustment of the spacecraft trajectories before mapping, which also ensures that the stereo digital topographic models (DTMs) are made consistent with altimetry and SAR topography profiles.
May 05, 2011
Rank: 4.4 / 5 (11)
Even if you push the argument that life on Earth came from another planet, well, then that other planet started life from nothing. We know that life could not exist in early universe, then life started to exist. Why do some people have such hard time grasping the logic?
May 05, 2011
Rank: 3.5 / 5 (6)
This, coming from someone whose belief in at least one higher being was not dissimilar to the beliefs of those who first came up with and touted spontaneous generation as an explanation for life appearing in certain environments. I'm sure the Christians continued this belief after the Greeks anyway.
Of course this was disproven (by Louis Pasteur iirc?) and you've clearly acknowledged that. But what's to stop the same forces responsible for planting life here from planting life elsewhere, such as Titan? I thought your God could do anything?
May 06, 2011
Rank: 5 / 5 (2)
May 06, 2011
Rank: 1 / 5 (4)
May 06, 2011
Rank: 5 / 5 (5)
May 06, 2011
Rank: 5 / 5 (1)
It's a good answer, to be sure. But not actually much to do with the point I was trying to make :P The part that bothers me is this omnipotent God is supposedly responsible for putting life here, but it's apparently well beyond his ability to put it elsewhere and total blasphemy to assume so even if to his credit. I'm failing to understand that 'logic' from kevinrts the devout.
May 06, 2011
Rank: 1.3 / 5 (12)
May 06, 2011
Rank: 1 / 5 (13)
From your incredibly simplistic logic I have to wonder if you understand the comlexities involved.
May 06, 2011
Rank: 5 / 5 (5)
May 06, 2011
Rank: 0.9 / 5 (54)
May 06, 2011
Rank: 5 / 5 (7)
Please provide evidence of the existance of your magical sky fairy. Then provide evidence that said fairy had anything to do with the writing of your favorite book of fables.
You keep making unsubstantiated statements in these forums based on nothing more than your superstitious beliefs, and you actually act as if that has some kind of credibility. Provide proof for your basic premise, or continue to accept being nothing more than comic relief.
May 06, 2011
Rank: 5 / 5 (2)
I wouldn't personally report QC. I may disagree with his basic beliefs, but at least he does engage in dialog. And he does also sometimes make comments that have nothing to do with creationism/evolution. Kevinrts is nothing more than a finite state automaton, with the predictable and repetitive drive-by postings. Frankly I'd rate him right along with the female goods postings.
May 06, 2011
Rank: 2.5 / 5 (2)
So have you (in other threads). I encourage everyone else to do the same as well.
May 06, 2011
Rank: 5 / 5 (7)
No it isn't, and by saying that, QC, you demonstrate that you don't understand christianity. The ONLY belief that is necessary to be a christian is the belief that Jesus Christ is the son of god, that he died for our sins, and arose on the third day in fulfillment of the prophecies. THAT'S IT!! Crap about dancing, baptism, speaking in tongues, or creationism is all irrelevant detail.
Here's a logical test for you, to illustrate my point. You've got two people, one of whom believes in creationism but not in Jesus, and the other who believes in Jesus but not in creationism. Who's going to heaven and who's going to hell?
Grow up, QC. Most xians DO NOT believe in literal creationism, and a god that would consign the majority to hell while letting in a minority of bad-tempered curmudgeons like you and kevin isn't worth believing in or worshiping.
May 06, 2011
Rank: not rated yet
100% correct! Couldn't have said it better myself and I'm a Christian. The "problem" is that some (or most) Christians don't get this and neither do some (or most) atheists.
May 06, 2011
Rank: 4.4 / 5 (5)
@kevinrts
Why do you find it difficult to understand that making an unsubstantiated imperative statement like this doesn't make it so, and doesn't convince anybody of anything? You are not authoritative and you are not recognized as authoritative. Before you can establish any base of credibility from which to make these kind of statements, you have to establish credibility for your base assumptions -- specifically that the bible is something more than a collection of shepherd's fairy tales, and your god is something other than wishful thinking. I keep asking for evidence of same (as do a number of forum regulars) and you keep ignoring the requests.
Please show evidence for the existance of your magical sky fairy. Then we'll pay some attention.
May 06, 2011
Rank: 5 / 5 (4)
Also, QC, and I'm probably beating a dead horse, but your second paragraph is presumably provided as 'proof' of your statement that creationism is a necessary part of christianity. Unfortunately it *doesn't* provide any support for the premise. You may *interpret* those passages that way, but that's not any more authoritative than the bald statement. You then summarize with another imperative statement as if you`ve just proved a point. Even ignoring that this is a science forum and the bible has no standing whatsoever, even by religious scholarship standards you have utterly failed to prove your point.
And if you`re going to continue to insist that they aren`t christians anyhoo, please make sure to advise god of your decision about the fate of their souls so he can update his books.
May 06, 2011
Rank: 5 / 5 (4)
The problem is that most xians don`t wish to examine their belief system on a `scholarly` basis, preferring to stick to simple black and white `talking points`. The problem with *thinking* about your faith is that A) it`s hard work, and B) it gives rise to the possibility that some of your beliefs may need revising. And I`m not talking about core beliefs like the trinity, or divinity of JC. Ppl like kev and qc hew just as diligently to minor stuff simply because the alternative is that they aren`t absolutely right about everything.
And it`s unfortunate because that fundamentalist attitude is what really gives (any) religion a bad name.
May 06, 2011
Rank: not rated yet
p.s. we have made experiments to see if long chemical chains make themselves. in a sealed and untampered environment. (some were anyway, others were subjected to heating or electricity ect...) and most did make long protein chains.
May 07, 2011
Rank: 5 / 5 (1)
May 07, 2011
Rank: 1 / 5 (2)
He is a troll because he propagates his belief in creation instead of evolution? Well.. I think both views must be respected. Personally I hope that there will be no 'tribal wars' here but common sense discussions..
May 07, 2011
Rank: 5 / 5 (5)
He doesn't want to discuss and learn, he just wants to make what he pretends is a meaningful point.
kevinrtrs is entitled to his opinion, but he should be actualy be willing to learn about science if he is on a science web site (or else just stick to religious web sites).
I'd be surprised if any of the actual scientists on this site go onto bible study web sites and waste the time of people there by pointing out what we see as evidence against what they are teaching - it is their web site, created for their purpose, and we respect that.
kevenrtrs should return that respect by not posting non-science here.
May 08, 2011
Rank: 5 / 5 (2)
Beyond that, very few non-religious people agree without evidence yet many religious people will consent agreement on faith. Tribalism requires superficial belief without evidence. You won't get that flavor of mob mentality without incredulity.
May 08, 2011
Rank: 1 / 5 (4)
Where do you get this belief?
Here is what Jesus said on those subjects.
In Matthew 25, JESUS used the modifier "everlasting" twice in regards to hell: "Everlasting fire" and "everlasting punishment".
And it was JESUS who said in Matthew 7, along with Luke 13, that there are FEW who go in through the narrow gate to life, and again, many would seek to enter in and, for whatever reason of disbelief or disobedience, not do so(lk. 13).
So I would ask you, if you are a christian, then what are you basing your beliefs on, since you reject the records of the only people who actually claim to have seen and heard Jesus' teachings first hand?
If God is not the creator of the universe, then the book of John must be discarded, due to the opening
May 08, 2011
Rank: 1 / 5 (4)
By definition, the term "God," or more specifically "Yahweh" is the creator and the first cause.
This is not only the Biblical teaching, but it is also the philosophical conclusion, even starting from the standpoint of extra-biblical naturalism, ontology, and metaphysics.
God is, by definition, the first cause.
"In the beginning was the Word and the Word was with God and the Word was God...all things were made by him and without Him was not anything made which was made."
Affirming both positively and negatively that God exists, all things were made by Him, and there are no other creators.
"Through faith we understand that the worlds were framed by the word of God, so that things which are seen were not made of things which do appear." - Hebrews 11,3.
This "faith" is not an illogical blind acceptance...continued
May 08, 2011
Rank: 1 / 5 (4)
This is not a "blind acceptance" of some axiomatic statement, even though it is an axiom, it can be proven philosophically, even if one refuses to see the physical evidences nature presents directly.
In the book of Revelation, Jesus, who is the speaker, says identifies himself thrice as "Alpha and Omega, the beginning and the ending". With the first occurrence of this terminology we see "which is and was and is to come."
And then along with the third occurrence of this terminology, he adds the terms "First and Last". This parallels statements that Yahweh made to the prophet in Isaiah chapers 41, 44, and 48, along with "I am the first and the last," and, "beside me there is no God."
Thus, in Revelation, Jesus is identifying himself through this terminology as that same God, the only true God, who spoke to the old testament prophet.
Read Job 40 and 41.
If you don't believe in Creation you simply do not believe in God or Jesus.
May 08, 2011
Rank: 1 / 5 (4)
4For if he that cometh preacheth another Jesus, whom we have not preached, or if ye receive another spirit, which ye have not received, or another gospel, which ye have not accepted, ye might well bear with him
So I would ask you, "Which 'Jesus' do you believe in?"
The ONLY Jesus the Apostles preached is and was the incarnate creator God who made everything that exists (John 3:16-19, 1 Tim. 3:16).
So anyway, who or what do you believe God is, if not the creator, the first cause?
You claim to believe in God, and yet don't believe in creation. By definition you have conflicting beliefs.
Who or what do you believe Jesus is, if not the "Only begotten Son of God"?
If you believe Jesus was a false prophet, or if you think he was a true prophet, but not the Christ, then you're not a Christian.
May 08, 2011
Rank: 1 / 5 (5)
Who is Jesus if not the Son of God, the Christ, the redeemer?
"...The Son of Man hath power on Earth to forgive sins..." - Matt. 9,6.
"Son of Man" is Jesus term for himself, because it identifies himself as a man in a mortal body, yet he is also the incarnate God.
In John 8,58, Jesus makes a direct claim to deity, saying, "...before Abraham was, I am...," which ties in with the story of Moses at the burning bush where God calls himself "I AM".
Also see the tenth chapter of John's gospel.
Seriously, anyone on this thread who cares, whether "believer" or unbeliever...read John's gospel at least one time, especially chapters 1 through 10.
May 08, 2011
Rank: 5 / 5 (2)
May 08, 2011
Rank: 1 / 5 (4)
I am not insulting anyone on this thread, but the people here who THINK they have some knowledge of the subject do not even have a typical sunday school student's knowledge or understanding of basic christian doctrine or theology.
The alleged Christians in this thread don't believe in creation and don't believe in hell, or at least not an eternal hell?
What is the point of salvation if you, an alleged christian, believe there is no hell?
What is Jesus saving anyone from if you believe there is no eternal judgment?
To whom is Jesus reconciling the world, if there is no creation and no hell?
Your faith is vain, because you do not even believe in the basic theology or ontology of who and what God, Jesus, or creation really are.
Do you see how silly it is claiming to believe in God, but not creation?
May 08, 2011
Rank: 1 / 5 (2)
Not sure about any other rabbit trails, but at some point, Frajo made a false statement about the psuedo-scientific hypothesis of Spontaneous Generation, to which I responded.
My other comments here have been addressing the gross and ridiculous philosophical, spiritual, and factual errors in the theology and doctrine of both the alleged believers and unbelievers on this thread.
It is relevant because cosmology necessarily ends up discussing creation at some point.
May 09, 2011
Rank: not rated yet
May 09, 2011
Rank: 5 / 5 (3)
"The theory of evolution does not invalidate the faith, nor does it corroborate it. But it does challenge the faith to understand itself more profoundly and thus to help man to understand himself and to become increasingly what he is: the being who is supposed to say Thou to God in eternity."
He is supposed to know something about Catholic theology. He has no problem fitting Darwin, evolution and persumably all the water on Titan into his doctrine without denying them all.
http://en.wikiped...volution
May 09, 2011
Rank: 5 / 5 (1)
How do you reconcile the parts of the bible that strictly go against what we consider proper morality.
The parts that say that women are unclean and should not be touched (and you should not touch things they touch) during their menstrual cycle. How about the parts that advocate slavery?
Here are some quotes.
When a man strikes his male or female slave with a rod so hard that the slave dies under his hand, he shall be punished. If, however, the slave survives for a day or two, he is not to be punished, since the slave is his own property. -- Exodus 21:20-21
Slaves, obey your earthly masters with deep respect and fear. Serve them sincerely as you would serve Christ. -- Ephesians 6:5
So, According to QC and Kevin, Slavery is not only Okay, there are specific rules governing how much you can beat your slave, who you can enslave, how slaves should act... etc..
May 09, 2011
Rank: 5 / 5 (7)
QC, I'm not going to continue this debate because A) I'm not really that interested in it, and B) all your arguments are missing the point. Here's the point: Most christians DO NOT believe in literal creationism, but DO believe in JC as the son of god, etc, yadda yadda. They exist. You can't make them go away by holding your breath. You can claim they're wrong, but they'll claim you're wrong. You can quote the bible, then they'll quote the bible. You can claim direct communication with god, then they'll claim the same. The point is that your stance on this is based only on stubborn repetition of your stance on this.
And I frankly don't care because it's all a bunch of fairy tales anyway.
May 09, 2011
Rank: 1 / 5 (2)
On topic I hope this leads to future robes to titan.
May 09, 2011
Rank: not rated yet
so there may or maynot be even water -- let alone life -- we have known about this for years --- MY QUESTION
How do we even check
What type of lander can even get close enough to check??? We are talking about getting through maybe miles of ice to check right -- so what are your ideas on this
Do we send a Nuclear powered base station to amplify signals from a nuclear powered submarine that lands and then melts its way down into this ocean??? Both radiation shielded of course to prevent killing any life they may meet. What is it made out of -- in my example a graphene outer shell i think would be the most effeciant use of energy as it has the highest thermal conductiviy and thus would heat up really quickly and dissipate that heat into the surrounding ice to melt its way down. Does that sound reasonable??
May 09, 2011
Rank: not rated yet
someone can be spiritual and not accept a westernized concept of God. Rememeber polythesism: well it is still the third most practised form of religion on the planet with about 900 million people practising hinduism - this is not couting the other poly's (no pun intended for those who know the reference)
Spirituality is deeply personal at the very least: only this new form of Chrisitanity that emerged post Revolutionary War has made an arguement of openly critising personal spirituality as if this too should conform to a 'norm' This practise has then spread to currupt free thought and expression of ideas and creative input: the creation of a dogma has created other dogmas in ares they SHOULD NOT BE: like science. Science is not an exact science and when it is we will conceptually KNOW everything about the universe that there is to KNOW: which will leave only those things which are unobservable to place in not faith but as unobservable:This still won't disprove GOD.
May 09, 2011
Rank: not rated yet
There are two conclusions in this thread brought about by two similamethodsds of investigation. The article itself proposes there is an 'underground' (as in below surface)ocean on Titan. The surface floats upon this liquid body.
The evidence they use is the observations that some surface points have moved "up to 19 miles". That we just saw Japan move up to 19 meters only means that we are pikers.
They are using secondary evidence of the existence of this fluid body. No pictures of this ocean have been taken, no core samples of the liquid, just a supposition of it being there.
There is a similar argument about God, god and gods .... He/She or it did not make a Youtube of creation - but the argument is that here we be, there must be sometexplaino explan that/us. This is another argument from secondary evidence.
Sorry gyus .... both leave me cold.
May 09, 2011
Rank: 5 / 5 (1)
As for the God thingie ... that is a purely ontological argument - this is so, therefor this must be so. (see St Anselm). If the explanation of our being is to rest on this - count me out. Indeed, where we came from is interesting to know, but does not really effect me - the here and now is keeping me too busy.
Yes, origins are important to biology, but not to my philosophy.
My last question is where did all these oceans of liquid methane come from? I have worked in the oil sands and you can see fossilized flora from fecund jungles of old, and the occasionaal dinosaur. But 'I ha's me doubts' that Titan was once covered by plants just waiting to decompose to coal, to oil, to diamonds.
Where did all these oceans of hydrocarbon come from. (and don't tell me God put it there on a slow day.)
May 09, 2011
Rank: 5 / 5 (1)
May 09, 2011
Rank: 5 / 5 (6)
Due to the abundance of oxygen on earth, carbon has ended up as carbonates and hydrogen as water, unless life has split out the carbon and hydrogen to make carbohydrates or oils (and in doing so freed up more oxygen that oxidizes any methane in the atmosphere in a few years). Thus methane here is typically associated with life (past or present).
In contrast out at Titan there is plenty of extra hydrogen, which consumes any oxygen not bound as silicates. At Titan's temperature this forms inactive ice, keeping the oxygen locked up. With plenty of hydrogen and no free oxygen, carbon is free to form methane and ethane without needing life.
May 09, 2011
Rank: not rated yet
They say this ocean is quite extensive - so at one time there must have been a considerable amount of free oxygen. They also mention the ice you refer to - but if there is ice, there must have been water at one time.
I do not doubt your explanation and am grateful for it ... but some of these things should have dealt with in the article.
May 10, 2011
Rank: 5 / 5 (3)
Being in a hydrogen-rich zone of the solar system, Titan should have proportionately more water (including ice) than earth does, and proportionately less iron and less rock.
May 10, 2011
Rank: not rated yet
even if that is a much more satisfactory explaination than: "'Cause God wants it that way..." it still brings up a myriad other questions. But they are, no doubt, for other times and other threads.
May 11, 2011
Rank: 5 / 5 (5)
ID isn't even a hypothesis. If you think otherwise, tell me exactly what you think constitutes 'design'. Chances are you can cite a design for one object, or perhaps a multitude of exactly similar objects, but you cannot cite a 'design' that would result in the diversity found amongst a single species, let alone all life.
May 12, 2011
Rank: 1 / 5 (7)
In reality: The Word of God + 6 days = life
May 13, 2011
Rank: 5 / 5 (7)
Bit off-topic there, as well as being incorrect. The theory of evolution deals with mutation and selection in living creatures; it does not address the origin of life at all. That particular topic is known as abiogenesis.
Jul 01, 2011
Rank: 5 / 5 (4)
Jul 04, 2011
Rank: 1 / 5 (1)
Science was also created by God. without God there is no knowledge, because all science would be just brain chemistry.
For knowledge to really exist, you need some external standard of truth beyond brain mass. In addition the laws of logic are required to enable reasoning. These laws are non-material. The very existence of laws of logic and the reality of knowledge refutes materialistic atheism.
Jul 04, 2011
Rank: 5 / 5 (1)
Well said, Dr,B - i have learned something about science here and something about the composition of planets .... (very little about theology).
Jul 04, 2011
Rank: 0.8 / 5 (49)
What's this even supposed to mean? The only positive reaction you are ever going to get from this 'argument' is knowing head-nods from those that already agree with you. So if something doesn't have a supernatural explanation it isn't real? I know where you start and where you end, but how you get there is a total mystery to me.