Exposing PseudoAstronomy

March 12, 2014

Podcast Episode 103: Does Jupiter Support Young-Earth Creationism?


Jupiter, gas giant:
Why do you oh-so confound
Evolution? Hmmmm?

Young-Earth creationism! Jupiter! What else do you need for a fun episode? (Other than an engaging host?) I had not planned on doing this episode, and I realize that it’s a day late. Why? Because I was going to do an episode entitled, “ε, Newton, Einstein, and Schrödinger.” And I had it mostly written. And then I looked back at episode 64 on quantum nonsense and realized that everything I was going to put in this new episode had already been done as the last section of the main segment in that episode. This was realized at about 6PM last night.

So, I quickly dug up an older blog post and converted it to an episode, had to go to sleep, woke up to the roofers (new roof due to flood damage), and got to record tonight). Here ’tis.

It has been requested (Hi Dori) that I post the current plan of upcoming episodes. This is highly subject to change (see above), but right now, they are:

  • Episode 104 – Pyramids on Mars – 2014/03/21
  • Episode 105 – Solar System Mysteries that were PseudoSolved, Part 3 – 2014/04/01
  • Episode 106 – James McCaney (General, Conspiracy, Electric Universe) – 2014/04/11
  • Episode 107 – The Fake Story of Planet X, Part 9 (Marshall Masters) – 2014/04/21
  • Episode 108 – The Norway Spiral – 2014/05/01
  • Episode 109 – Practical Application of Uncertainty – Orbits and Spacecraft Observations – 2014/05/11

August 7, 2011

Mercury’s Uniqueness Revealed by MESSENGER: Does It Mean a Recent Creation?


Introduction

An interesting thing that happens when you’re defending your thesis and consequently not blogging for a few months is that other blogs can crop up that tend to cover similar material. In this case, there is a blog entitled, “Eye on the ICR” run by a high school student from New Zealand. Ah, if only we had blogs back when I was in high school … though I probably wouldn’t have been writing against creationism as my topic of choice.

Anyway, this New Zealander seems to take great delight in ripping to shreds the news postings by the Institute for Creation Research (ICR) writers. Much as I do. Unfortunately, he’s posted his before me! (And I couldn’t find his name on the site, so throughout this post, he’s the “high school student.”)

Whatever … he’s still a high schooler, I’m a Ph.D. astronomer. Hopefully I can add something to the conversation he started. We’ll see.

Mysterious Mercury

This post is yet another about the “science” writer, Mr. Brian Thomas, and in this case his ICR article, “Messenger Spacecraft Confirms: Mercury Is Unique.” First off, the name “MESSENGER” is an acronym that stands for “MErcury Surface, Space ENvironment, GEochemistry and Ranging.” In other words, you need to capitalize it, unless you’re writing for the BBC which doesn’t seem to capitalize acronyms. Ah, we’re off to a good start.

After the title, Mr. Thomas does his normal routine of spending a paragraph or two (in this case one) giving some very brief background about the subject. It’s okay, something you’d get in a normal news article but which most third graders know.

Then we get to the line that those who are familiar with young-Earth creationist (YEC) writings know is the kicker: “Mercury possesses unique characteristics … clues point in the opposite direction to what astronomers expected.” Yes, that’s right, because something is not exactly as a model predicts, God did it. That’s basically what the remaining six paragraphs say.

A High Density

The third paragraph presents Mr. Thomas’ first problem-of-choice: Mercury’s high density and large core. The issue is that Mercury does have a high overall density. In fact, it is the second highest of any planet at 5.43 grams per cubic centimeter (water = 1); only Earth is more dense, at 5.52. But, Mr. Thomas quotes Spike Psarris from 2004 claiming, “according to naturalistic origins models, ‘Mercury can’t be anywhere near as dense as it actually is.'”

For my very loyal readers (hi Joe, Susan, Karl), you might remember that I discussed Spike Psarris twice (here and here) in ripping apart a 12-minute video segment he produced on why Jupiter needs God to have created it 6000 years ago.

In skepticism, we often give YECs and Intelligent Design (ID) proponents the proud title of the best examples of quote miners. In this case, a creationist (Brian Thomas) is quote mining another creationist (Spike Psarris). Spike does indeed say that in his 2004 article. But he actually goes on to explain that we have a perfectly reasonable natural model for how Mercury got as dense as it did. Granted, Spike in his own special way then tries to rip it to shreds through an argument from personal incredulity, but that’s somewhat beside the point for this post.

For those wondering, the “evilutionist” way of explaining this is that Mercury was involved in a massive collision early in its history that stripped away all of its crust and a large portion of its outer mantle, leaving behind the core of an originally much larger planet along with some mantle material. We know that these kinds of large collisions happened in the early solar system, there is an enormous amount of evidence for that, so it is perfectly plausible that this is what happened on Mercury. Despite what Spike says.

Too Much Sulfur?

Paragraph four of Mr. Thomas’ article states, “assuming that the planet formed naturally and close to the then-forming sun, lighter-weight elements like sulfur should have been ‘lost in space,’ … and yet Mercury has ‘high levels’ of sulfur.” Hmm. I guess that means evolution can’t be true and God created everything 6000 years ago.

As with pretty much the rest of this article – and I’ll just point it out here for the time-being – Mr. Thomas does not actually make an independent argument for a 6000-year-old universe created by God. He simply tries to cast doubt on his own – highly limited – understanding of planetary astronomy. Anyway, moving forward …

Yes, one of the interesting discoveries of MESSENGER is that it detected high levels of sulfur on Mercury. And yes, Mercury likely formed close to the sun, well inside the temperature line where we would expect lighter elements and molecules to be gaseous and not condense and be incorporated in large quantities into forming planets. Except, well, obviously they did. And there are numerous ways of getting them to these planets — remember I talked in the last section about lots of massive collisions? This is the way we think Earth got most of its water.

Magnetic Fields

Paragraphs five and six talks about the magnetosphere of Mercury:

In the Space.com Q&A, Solomon commented, “I’m now fascinated by the magnetosphere.” And it is small wonder that he is, because for many years the “dynamo theory” (which has since been shown to be false) was the only explanation offered for magnetic fields on rocky planets that are supposed to be billions of years old. However, this theory requires a molten magma core. And Mercury is so small — only slightly larger than the moon — that its core should have cooled into a solid millions of years ago. Therefore, it should not have a magnetic field at all … . And yet it does.

Messenger’s new magnetic measurements fail to explain why Mercury has a magnetic field. Instead, they add ammunition against a naturalistic origin for the planet. Scientists did not expect to discover that Mercury’s magnetic field is lopsided, but the 2011 Messenger data showed that it is stronger in the north than it is in the south. What natural process would cause that?

I actually want to disassemble the second part first, in that the “magnetic measurements fail to explain why Mercury has a magnetic field.” As a science writer, Mr. Thomas should know that measurements (data) do not explain anything. Data are data (“data” is the plural form of “datum”). They have no explanatory power in and of themselves, the data simply are what they are. It is how the data fit into models that will then support or refute them.

Further, on the lopsidedness of the field. I know I’ve said this before, but for new readers and returning ones who like the reminder: That’s what science is!! We want to find something we can’t immediately explain because that means that we can then go try to figure out why it is the way it is! It’s only YECs that don’t want anything that doesn’t fit with their own Goddidit model because that would mean that, gasp!, maybe goddidn’tdoit. In fact, Mr. Thomas, in what is obviously meant to imply that goddidit, asks the exact question that I’m sure that mission scientists are trying to answer: What process causes a lopsided magnetic field?

Okay, back to the first paragraph quoted above. I’m not even sure I really need to go into this too much. Suffice to say, yes, the fact Mercury has a strong magnetic field was a surprise when it was discovered, and it is actually one of the main questions that drove the MESSENGER instrument suite choices that will try to gather the data that will be used to test and further develop models to explain why it has an active magnetic field. Obviously, ongoing scientific research is just too much for Mr. Thomas to handle, though, because he clearly wants these observations to force us evolutionary astronomers (I still don’t understand what evolution has to do with astronomy) to throw up our hands and admit that his God did it.

Oh yeah, and the whole “dynamo theory which has since been shown to be false” is him blowing out his you-know-what. That’s about the only outright lie I came across in this article.

Final Thoughts

I’m not sure what it takes to be a science writer with ICR. I actually looked over their site for a job description or any information related to jobs, and all I found were bible versus from the Book of Jobs. Go figure. Regardless, I don’t think the requirements can be much, especially any knowledge of science. In the next-to-last paragraph, Mr. Thomas clearly shows his ignorance: “If nature formed the planets from the same cloud of space debris, then why are they not uniform in constitution, orientation, and placement?”

I have explained to 6-year-olds why there are differences in objects in the solar system even though they formed from the same “cloud of space debris.” And they understood it. (One of the big reasons is that, as the sun heated up, it caused a temperature gradient in the cloud that resulted in significant compositional differences in the inner and outer solar system.)

Mr. Thomas, please, do your homework next time. And by that, I mean read something other than the bible or Spike Psarris. But, I suppose when you’re content with a god of the gaps outlook on everything in life, actually learning something new is not important.

Oh, and in all seriousness, check out the Eye on ICR blog if you like reading this kinda thing. A high school student willing to take on the ICR, even if it’s just in a blog, and point out their foolishness is pretty cool. When I was in high school, the only creationists I confronted were classmates (ah, I still remember 7th grade when I made a girl cry just by saying that we didn’t know why the Big Bang happened, but who created God?).

May 28, 2009

Jupiter: Further Confounding Those Darn Evolutionists


Introduction

Today I had a happy occurrence – Phil Plait mentioned me in his “Bad Astronomy” blog in the context of my previous post on this subject. As a consequence, my blog received over a 5-fold increase in hits. Thanks, Phil, and thanks to all of you who came here from the BA blog.

The purpose of this particular post is a follow-up on that first one. In the first one, I wrote that the video sample on the CreationAstronomy.com blog is approximately 13 minutes long. However, I was only able to view about 4 minutes of it for free from the website. Well, one of the readers of my post sent me a link to download the full section of the video.

So, without further ado, let’s examine the claims in the next 9 minutes of the video.

The Rest of Psarris’ Claims

1. “The more we study Jupiter, the more evolutionists have realized it doesn’t fit into their models.” He then shows another quote from Richard Kerr (the same author he quoted from out of context in my first post on the subject) stating, “… no one has a satisfying explanation of how they were made.” Psarris then states that, no, that’s not true, “the Bible has a very satisfying explanation of how they were made.” (3 min 50 sec)

2. “Jupiter has over 60 moons; they pose problems for evolution, too.”

2.a. “Ganymede has one of the most bizarre surfaces in the entire solar system. … Evolutionary models predicted that Ganymede couldn’t have a magnetic field. But when our space probes arrived and started taking measurements, we found that it does have a magnetic field.” (4 min 30 sec)

2.b. “Then there’s Callisto. This moon is the most heavily cratered object in the solar system. Evolutionists believe that it has one of the oldest surfaces of any object, about 4 billion years old. It was a real surprise, then, when our space probes took some close-up pictures.” It was expected that there would be many small craters, but there was a lack of them. Also, “some of the pictures show what appears to be fresh ice on Callisto’s surface, … [but] evolutionary models say Callisto is old, cold, and dead.” (5 min 30 sec)

2.c. “Next, there is Europa. … Europa is the smoothest [object in the solar system]. … [The ice on Europa] is several miles thick, but some scientists think there might be liquid water beneath it. And where there’s water, there has to be life, right?” Apparently in a previous video section he addressed “how ridiculous that idea is,” but Psarris goes on to say, “you still hear it in the news a lot: Somebody finds a new crack on Europa, and thinks, ‘Ooo! Look! Water might ooze into the crack, and there could be life evolving in the water!’ Then some reporter runs a story about it saying we’re on the verge of finding life elsewhere in the solar system even though all we found was a crack in a moon.” (6 min 30 sec)

2.d. This claim deals with craters on Europa, about which he makes a claim straight from the Institute for Creation Research (I know this because I already debunked this claim before): “Because Europa has only a few craters, we’ve been able to study them closely. One recent study has shown the evolutionary model for cratering is all wrong.” He goes on to explain that it’s apparently wrong because a single crater forming can create up to a million or so smaller, secondary craters (formed by debris from the primary crater event). Because of this, he makes the claim that you need fewer impactors to make all the craters we see, which then implies a younger age than “all these billions of years.” Psarris then extrapolates this to Venus and the moon. (I’m not going into significant detail here since I’ve addressed it extensively before, and I’ll talk about it in my next section where I address these claims.) (7 min 10 sec)

2.e. For the last of Jupiter’s large moons, Io, Psarris makes light of the massive volcanism on Io’s surface. Psarris’ main claim is simply that Jupiter’s tidal heating of Io is not enough to account for all the heat, so some of it must be left-over from its formation which means it formed recently. (9 min 15 sec)

2.f. The second of the Io claims is that, given the amount of lava that is erupting, Io must have completely recycled itself 30 times in the ~4.5-billion year history of the solar system. (10 min 30 sec)

2.g. We get a third claim out of Io: Apparently, astronomers were “flabbergasted” to learn that the temperatures of the lava on Io reaches 3000°, when it only reaches 2000° on Earth. Also, the lava is dense when it should be formed of low-density material by this point due to simple differentiation (heavy stuff sinks). (11 min 20 sec)

The rest of the video (post-12 min 15 sec) is a review of all the points that Psarris makes. But, there are some typical statements at the end:

  • “Evolutionary models fail utterly to explain Jupiter.”
  • “Building Jupiter has long been a problem for theorists.” (Wetherill, 1995)
  • “I don’t think the existence of Jupiter would be predicted if it weren’t observed.” (Wetherill, 2001)
  • “Why do they still cling to a broken model? Because when you reject the Truth, you have to accept a lie.”
  • “Pity the poor evolutionist, who is so committed to a bankrupt theory that he can’t see the hand of his creator in this majestic planet.”

Addressing the Remaining Claims

1. No Models Explain How Jupiter Formed

This is simply not true, and at its nicest level is taking statements out of context and sorely downplaying the status of solar system formation modeling. I address this quite a bit in my first post in this 2-part series.

The other aspect of this claim that deserves to be addressed is the very common “god of the gaps” logical fallacy: “We don’t know how this happened, therefore God did it.” Among the skeptical community, this often is compressed into the single word, “goddidit,” because we hear it so often from Creationists. The basic fallacy here is that you confuse something that we don’t currently know with something that we can’t possibly know, and therefore it is only explainable through the miracles that a divine creator can make.

2.a. Ganymede

Ganymede’s magnetic field is interesting. But, as I stated in my first post about this CreationAstronomy.com site, that’s what makes astronomers happy! We like it when we find something that we can’t immediately explain. If nothing else, that means Job Security! But on a more explanatory level, the theory for the formation of a magnetic field on a planetary scale is that it requires a molten interior, but Ganymede shouldn’t have one by this point in its life because it should have cooled. On that point, Psarris is correct. But, what does this mean, then, for an explanation?

It means that we need to explain how Ganymede’s core could have either remained warm until at least 1 billion years ago or was heated up until about 1 billion years ago (since a remnant field can still exist for ~1 billion years even without something actively driving it). What modelers have come up with is that the main jovian satellites were not always in their current orbits, but that they slowly migrated into them. This migration passed through resonances until it got to its current resonance of 1:2:4 (Io, Europa, Ganymede … Callisto isn’t really in a resonance (yet)). Getting into this resonance caused enough tidal heating to create a dynamo in Ganymede’s core. In other words, there’s a perfectly reasonable dynamical model that explains this without resorting to goddidit.

2.b. Callisto’s Lack of Small Craters

This is another (almost) true observation about Callisto: It does lack as many small craters as were predicted from simple cratering models. Note here that “small” is ~1 km sized craters and smaller. Before I get into possible explanations, though, I have to pose the likely rhetorical question: How does a lack of small craters prove the solar system is young? I honestly don’t see how it has any relevance to it, other than under the quite childish false dichotomy notion that, “if I can show you’re wrong, then I must be right!”

What this implies, however, are a few different things. One idea is that the main impactor population of Callisto – possibly comets – simply lacks a small size population (impactors a few 10s to 100s of meters). Personally, I don’t find that explanation incredibly convincing from my own research in craters, however. Another possible explanation (Bierhaus et al. (2000) “Small Crater Populations on Callisto”) is that it is simply a resolution issue, and that when viewed under higher resolution, previously indiscernible small craters become evident.

There are also other possible explanations here, but my main point is one that I’ve been stressing when dealing with this CreationAstronomy.com website: A lack of conforming to known, simpler models is something that astronomers – and scientists in general – like, because it means that they then get to go and figure out a new model to explain the new results.

2.c. Europa -> Liquid Water -> Life?

This claim is one that I’ve addressed before, namely in my post, NASA’s “Follow the Water,” Ice Detected by Phoenix on Mars, and Noah’s Flood. It’s one of my older posts so not as well organized, but the basic idea is that all life that we know of needs liquid water to live. Therefore, the first step in attempting to find life is to find places where liquid water is. It’s that simple.

2.d. Europa and Secondary Cratering

This is another claim that I have addressed, in-depth, before. The post is, Dating Planetary Surfaces with Craters – Why There Is No “Crisis in Crater Count Dating”. Psarris’ claim really is identical to this ICR article. The basic response boils down to: Astronomers know of the issue. And we take it into account. It’s another of the classic creationist tactics where they will give you a problem with “evolutionary” science and then say it invalidates everything about science, but they don’t tell you that we already know about the issue and take it into account.

2.e. Io Is Too Hot

Says who? I have not heard nor seen this claim before, and I took a graduate class from the guy who literally wrote the book on Jupiter’s moons. If Psarris would like to show his calculations, I will gladly look over them and get back to this claim.

2.f. Io Is Erupting Too Much

While the basic idea behind this claim is not new, I have never seen it before raised as an issue. Planetary crust is recycled. Stuff coming out of volcanoes on Earth now used to be buried miles beneath the surface which used to be on the surface. I’m sorry, but I honestly don’t see the issue here with this claim.

2.g. Io’s Lava is Too Hot and Too Dense

First, I just love it when articles say that scientists are “flabbergasted,” “surprised,” “shocked,” “astounded,” “puzzled,” “clueless,” “can’t understand,” “unbelieving,” “amazed,” “bewildered,” “baffled,” and other such phrases. (Okay, more honestly, I really don’t like it.) Seriously, we’re apparently the people who are supposed to know everything and so it’s like a “gotcha” game when there’s a discovery that “surprises” us. Need I repeat it? THAT’S THE POINT OF SCIENCE — TO FIND OUT NEW THINGS!

Alright, deep breath … now, what about the temperatures of Io’s volcanoes. Again, I do not know of why this is particularly an issue. If Psarris would like to show his math – or show someone else’s as to why magma cannot be heated to 3000° on Io, I will take a look at it. But this is another case where I do not particularly want to do his work for him to then add more work to my own plate.

Final Thoughts

I’ll start off by saying that I threw this post together rather quickly (if “quickly” can mean an hour of writing and looking things up and watching the video segment), so I apologize if I seem a little flippant at the end, brushing off his claims.

However, my point really is the same: If he is going to make the claim, he needs to back it up. You can’t just state something and leave it at that and expect people to bend over backwards to flesh out your own claim and then go to the trouble of pointing out why it’s wrong (if it actually is). And at least with the few physics things that Psarris addresses (basic thermodynamics), he needs to show the math. Otherwise, it holds as much weight as me saying that my oven can’t possibly heat up past 500° by itself therefore it contains heat left over from its formation which means it’s young.

Otherwise, I hope that at the very least this post will lead you to question the validity of Psarris’ claims. And if you’re already a firm critic of young-Earth creationism, then I hope that I have armed you with more information to stop the spread of bad pseudo astronomy.

May 23, 2009

Jupiter: Confounding Evolutionary Models of the Solar System


Introduction

Making the rounds on the blogs and skeptical websites – including PZ Myers’ Pharyngula blog – is an up-and-coming young-Earth creationist, Spike Psarris and his CreationAstronomy.com website. Now, when I was made aware of this site, I tried to go to it but kept getting 505 errors meaning that they had exceeded the bandwidth they paid for.

I’m guessing this was due to PZ’s blog post about it. Well, a few hours later, it was back up and I got to see what the hooplah is about. It’s a guy selling a YEC DVD. He has a free preview on his site – at least at the time of writing this blog – that shows the intro to the DVD and the “chapter” on Jupiter.

The title of this blog post is what he claims within the first minute of the Jupiter video segment. The rest of this post will be correcting the errors, half-truths, and misstatements throughout the rest of the 13-minute video.

Update: I have posted a follow-up analysis of the Jupiter segment claims that are not addressed in this post here: “Jupiter: Further Confounding Those Darn Evolutionists.”

Psarris’ Claims

There are many claims made in this segment. The main points are the following:

1. “Evolution says Jupiter can’t be spinning as fast as it is … [because] evolutionary model make certain predictions about how fast a planet should spin.” He then quotes a “recent” article to back this up, where “recent” is 1992. He then makes the argument that evolutionary models cannot supply the energy to spin up Jupiter such that its day is only 10 Earth hours long. (1 min)

2. “Evolutionary models predicted that Jupiter would lack certain elements, Ar, Kr, Xe, N, and others. But it turns out that Jupiter has lots of these elements. … [An overview of the article of the results said] ‘Jupiter is the largest of all the planets, but results in Nature now reveal the embarrassing fact that we know next to nothing about how – or where – it formed.'” (2 min)

3. “The evolutionary model requires Jupiter to have a large core inside of it [at least 10 times the mass of Earth]. This would have been necessary for Jupiter to form from the solar nebula billions of years ago. Unfortunately for evolution, a recent space probe measured the mass of Jupiter’s core. … We now know that, at most, the core can only be 3 times the mass of Earth. … Jupiter does not match evolution’s predictions.” (2 min 30 sec)

4. The next claim is that models require 10-100 million years for a planet like Jupiter to form, but that the solar nebula would have dissipated around the sun within 5 million years. “So, according to evolution, Jupiter shouldn’t exist at all.” (3 min 15 sec)

This is where the video stops for me. Even though my player lists the video as being 13 min 28 seconds long, it keeps stopping after 3 min 54 seconds. But, that’s really enough to get a flavor of the video, so let’s get to what’s really going on.

The First Big Clue

Okay, even if you’re a young-Earth creationist, please please PLEASE stop talking about astronomy in terms of “evolution,” “evolutionists,” and “darwinism.” The Theory of Evolution has ABSOLUTELY NOTHING to do with astronomy (unless you are talking about really far down the line things). Natural selection says nothing about how planets form. Punctuated equilibrium has nothing to do with the gases in Jupiter’s atmosphere.

Now that I’ve gotten that out … the first big clue as to an alternative agenda (as if that weren’t obvious from the get-go) is relating evolution to astronomy. As if somehow showing that Jupiter’s rotation rate cannot be explained by an outdated model has something to do with the validity of common descent of species. And this is quite telling in this clip because in practically every single sentence, Psarris claims that this has to do with evolution, evolutionary models, or evolutionists.

With that said, I will not address the non sequitur “evolution” references in each and every claim when I address them in the next section.

Addressing the Four Main Claims

1. Jupiter’s Rotation Rate

First off, I should note that we have known what Jupiter’s rotation rate was as far back as 1835 (since that’s the first paper that I can find on the subject) but I would guess that Galileo was able to estimate its rotation period, as well. For those interested, here is the article from 1835.

With that out of the way – we know how fast it’s spinning on its axis – how does it spin so quickly? The preliminary question would be, why does it spin in the first place? This webpage has a pretty good simplified explanation for why objects in the solar system spin, and why they mostly spin in the same counter-clockwise direction (when viewed from the North Pole). The basic one-liner is that the protoplanetary disk was orbiting the protosun in the same direction, and due to the differential rotation within the disk, a net spin was imparted onto any condensing objects.

And now we get to the part where the objects spin quickly. This is the classic ice skater analogy: If your spinning on the ice and you have your arms extended, you will spin slowly. If you bring your arms closer to your body, you will spin faster. That is because of the conservation of angular momentum. Now let’s say you put 20-lb lead weights in your hands. If you now bring your arms close to your body, you will spin even faster than before. In other words, the more mass you bring close to the center, the faster you will spin.

Jupiter has a lot of mass – the most mass of any object other than the sun in the solar system. It also has the fastest rotation rate. Saturn, the second-most massive planet, has the second-fastest rotation rate. Neptune, which has the third-largest mass, has the third-fastest rotation rate. See a pattern?

Now, I’m not sure what “evolutionary model” he’s talking about that predicts a slower rate. He doesn’t cite his source. Regardless, he has not presented any case that anyone should take seriously as to why Jupiter “can’t” spin quickly under an “evolutionary model,” so at best this is an unsupported claim where the burden of proof is solely upon him to at least present reasoning rather than a simple claim.

Update since original post: I have now obtained a copy of the paper that Psarris quotes from (Kerr, (1992), “Theoreticians are putting a new spin on the planets,” Science, 258: 5082, p. 548.). This is a very obvious example of a fairly common YEC tactic, quote-mining. This is where they search for a line or two in pretty much any scientific paper/book/press release and use it completely out of context.

In this case, the quote is, “The simulated bombardment leaves a growing planet spinning once a week at most, not once a day.” The main problem is that, just as I point out in the rest of my blog, this isn’t a “naked” announcement — the two teams that this paper cites have modified current models in order to explain how the planets spin faster than once a week. In fact, that quote comes from the fourth paragraph. The second paragraph states: “Neither group claims to know exactly what actually set the planets spinning so furiously. But both groups–Stony Brook’s Jack J. Lissauer and David Kary and Toronto’s Luke Dones and Scott Tremaine–are ready with alternative scenarios. Lissauer and Kary favor a modified version of the small-collisions scenario, but Tremaine and Dones lean toward a more catastrophic mechanism, in which planets acquired their spins from a few giant impacts, or even one, late in their evolution.”

I can’t go on to quote the paper verbatim because that is not the purpose of this blog post and it is not completely legal (and the paper requires a subscription to the journal in order to read it). But the upshot is that this paper simply describes, in short, two small modifications to the main planetary formation models that can better account for a preferred direction once you consider even more of the real, physical dynamics that occur in a protoplanetary disk.

2. Elemental Composition

This second claim is at best misleading, at worst just an outright lie. The main composition of Jupiter is H2 (molecular hydrogen) at 89.8% (±2.0%). The secondary element is He at 10.2% (±2.0%). Notice that those two add up to 100%. Now, there is a very little bit of other stuff, but it is what we call “trace,” meaning that there is very very little of it there.

The main trace constituents are methane (0.3±0.1%), ammonia (0.026±0.004%), hydrogen dueteride (.0028±0.001%), ethane (0.00058±0.00015%), and water (0.0004% (varies with pressure)). This is data from NASA’s Jupiter Factsheet.

Looking at a recent paper, the amount of argon in Jupiter is about 2.5x the sun’s or ~0.0009% of the total composition. Krypton is 2.7x the sun’s, or ~0.0004% the total composition. Xenon is 2.6x the sun’s, or ~0.0004% the total composition. And nitrogen is 3x that of the sun’s abundance, or ~0.0003%. It’s noted in the paper that the nitrogen amount is likely off, that the probe landed in a “hotspot.”

Now why are these tiny tiny numbers cause for mention? Well, they do show a relatively significant enhancement over the solar abundance, and Jupiter is supposed to be reasonably like the sun in its composition. But not totally. What I have noticed that creationists commonly fail to realize is that scientists want to make observations that disagree with their theories. But rather than throwing away their theories, they modify them in order to improve the theories so they can explain all of the evidence. That is what has happened since the determinations of the jovian atmospheric composition: It has placed constraints on models of Jupiter’s formation. Rather than make assumptions, we now have legitimate constraints upon parameters, like where in the solar nebula Jupiter may have formed, or where the smaller pieces that combined to form Jupiter may have formed themselves.

That is what real science is: Making a model from current observations and then making predictions from that model. If future observations do not match those predictions, then the model must be altered or replaced in order to be able to account for the new observations. We can still build Jupiters in planetary formation models (as opposed to evolution models). We just now have more constraints upon how, where, and from what they form.

3. The Core of Jupiter

This claim is fairly silly at this point in time. Before the Galileo probe reached Jupiter in the 1990s, estimates of the size of the core of Jupiter were around 5-15 Earth masses, though the actual value varied considerably based upon what model you used and what you assumed (think back to section 2 above on how science is done).

Once Galileo reached Jupiter, it was able to take various measurements and it being in orbit allowed various tracking stations on Earth to record its position — allowing us to create a model of Jupiter’s gravity field. This, along with Jupiter’s moments of inertia, are needed to really constrain models of how big Jupiter’s rocky, solid core may be — or if it even has one.

The current state of the science, however, is inconclusive. The measurements from a decade ago were not good enough to conclusively state whether or not Jupiter has a core, and how large it may be. The data generally indicate that the core can be no larger than ~12 Earth masses — a far cry from whatever source Psarris used that said the core can be a maximum of only 3 Earth masses. But, the results from Galileo provide few limits towards the size of the core, and so it is still not well-constrained. One example reference is: Guillot, Gautier, & Hubbard, (1997), “New constraints on the composition of Jupiter from Galileo measurements and interior models” Icarus.

Another recent paper (where I use “recent” as meaning 2008) models what Jupiter’s core will be from first principles of physics and comes up with 14-18 ±6 Earth masses, within the range of what Galileo results show.

4. Formation Timescale

The next claim is that the solar nebula would disappear within 5 million years, but Jupiter takes 10-100 million to form. Obviously a problem!

But that’s what happens when you take the extreme numbers on the one hand with the opposite extreme numbers on the other, along with outdated models.

Let’s look at the 2004 publication, “Formation of the giant planets,” from 2004. The author clearly states that the protoplanetary disk will dissipate within 1-10 million years. So, yes, the “5 million years” number Psarris quoted is reasonably accurate and jives with the latest science.

However, this isn’t a “gotcha” moment for the YECs. It’s not as though they caught us astronomers with our proverbial pants down, that we didn’t realize there’s a contradiction here. We do. And yet again, this simply serves to place further constraints on how planets can form. And new models have come out of it.

The main model of forming planets is referred to as the “core instability model,” and it takes 6-8 million years to form a nice-sized gas giant. A possible problem. Then there’s the “disk instability model,” which is at-present poorly modeled but promises to form planets somewhat faster. This is still a very active area of research, and the state-of-the-art can change over the course of a grad student’s tenure. (Case-in-point: There was a grad student in my program who was 4 years ahead of me who, when I took the “Planetary Formation” class my third semester, sat in on the class. I asked him why, and he said that it’s changed so much in the 4 years since he took the class that he wanted to see what people were discussing now.)

One example is this model which proposes a diffusive redistribution of water as one of the primary mechanisms for forming Jupiter, and they can form Jupiter’s core within 100,000-1,000,000 years. Or there’s this paper, which forms the gas giants by concurrently accreting both solids and gas (generally thought to accrete separately). It can form Jupiter and Saturn in 1-10 million years.

Of particular interest in planet formation, to be honest, is how Uranus and Neptune form. All models require significantly longer timescales for them because they are farther from the sun. The fastest I’ve seen still requires ~2x as much time to form. them as Jupiter and Saturn, but they have to form while there’s still enough of the solar nebula left.

The very first line of a 2002 paper by Thommes, Duncan, and Levison states, “The outer giant planets, Uranus and Neptune, pose a challenge to theories of planet formation.” Even though this was written over 8 years ago, it still holds true today. They do pose challenges. But astronomers welcome those challenges as opportunities to learn more about the universe around us rather than throw up our hands and turn to a young-Earth creationist model, which is ultimately what Psarris wants you to do.

Final Thoughts

In general, Psarris is not presenting new arguments. I’ve heard of the last two before, though not the first two. And I can almost guarantee that he uses some of the classic arguments that I’ve addressed before in other sections of his DVD.

What’s the bottom-line? He points out apparent observational evidence that seems to conflict with the “evolutionary” picture of Jupiter. The problem with that is astronomers know about these problems – if they are problems at all – and we actually use them rather than ignore them in order to refine models of how Jupiter formed and has changed through time. All because it has 3x more nitrogen than the sun does not mean that astronomers will suddenly throw up their hands in despair and change their views to reflect that of young-Earth creationism.

But, for $19, that’s what Psarris is going to try to convince you of.

Update: I have posted a follow-up analysis of the Jupiter segment claims that are not addressed in this post here: “Jupiter: Further Confounding Those Darn Evolutionists.”

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