Just to add some of my commentary. Although, be advised, this isn’t the field I am mainly working on, so feel free to correct anything I say here. I will also try to avoid making the same points that were already made by someone else.
1. How Science Works
I think this discussion highlights one important point about how science actually works. First scientists start to construct a model (aka a theory) that accurately describes the world to the best of the current understanding. However, the model is not complete, mainly because the knowledge about the world at any given time is not complete. Scientists are human and they of course not infallible. So as time goes on, and further experiments / observations occur that improve understanding and continuously test the predictions of the models, chances are that some of these new results don’t match the expectations of our model. So what happens next?
Outside the scientific community: Such discoveries often get abused to paint a negative picture about science as a whole. This is the old “Scientists have been wrong before, so why should be believe them now?!” tirade that is used in many pseudoscience and anti-science circles. The best (and funny) example I can think is the “Science is a lair… sometimes” Scene from the ‘It’s always sunny in Philadelphia’ show.
Within the scientific community: When discrepancies between results and expectations are observed, the following things happens (of course I am simplifying an otherwise very complex process):
- Scientists will attempt to verify the results through independent replication of the tests. If confirmed move on to the next step.
- The scientists will make attempts to improve the model. The problem could be solved by minor or major updates/modifications to the theory, yet the theory remains in place.
- If someone proposes a completely new theory, which (A) describes all the previous observations with the same level of accuracy as the current theory, and (B) makes predictions are not identical as those made by the previous theory, yet are repeatedly confirmed.
Then we are at the cusp of a “paradigm shift”.
Step #2 and #3 are simply omitted when someone insinuates that, when something unexpected is discovered, this MUST mean that the current theory is wrong and should be abandoned. Often they think step #2 is like they are cheating the bona fide scientific procress. “This isn’t science. They are just desperately tryiing to safe their theories from conflicting data”…yadayada. This is simply not the case for two reasons. (1) Conflicting observations could mean that the theory is wrong, but it also could very easily mean the model is incomplete and that it should be updated instead. The latter in fact occurs far more frequently than the former. (2) Even if the theory is proven (or is shown with great certainty) to be wrong, we still shouldn’t abandon it immediately, because an imperfect theory is better than no theory. Only when a better theory comes along, that’s when the old model is abandoned (although the flawed theories are often still taught because of their simplicity and sufficiency to describe the world under limited contexts; e.g. classical physics and the Bohr model of the atom).
To give a standard example of this process: Newton provided a very accurate description of the motion of physical objects and gravity, including those of the celestial bodies with very high accuracy. However, the orbit of Uranus didn’t match the predictions of Newtonian physics. So did the scientists just throw their hands up and toss Philosophiae Naturalis Principia Mathematica into the river? No. They updated the model by including a new planet further out that disrupted Uranus’ orbit. That planet was later discovered (Neptune). So this would be an example of #2 in the previous steps. Now, later it turns out that the orbit of Mercury similarly also deviated from the expectations. For a long time, scientists had a similar answer. Another planet, that was preemptively named “Vulcan”, but never discovered. Because it doesn’t exist. This is where Einstein came in with his theory of relativity, which (A) accurately describes the same observations just as accurately as those described by Newtonian physics, and (B) Relativity makes accurate predictions that aren’t identical to those made by the former theory; e.g. Mercury’s orbit, time dilation, bending of star light by the mass of the sun (seen during a solar eclipse) and gravitational waves. This would be an example of #3.
This is why I often get frustrated when discussing (my main field of interest) evolutionary biology with creationists. When they ask me how X, Y, Z, etc evolved, often I am able to give an answer with citations (that will frequently get ignored anyway; first reason for my frustration). Alternatively, when I don’t know the answer, I will freely admit that we don’t have an explanation for those things. This invariably is followed by insinuation that therefore all of evolution must wrong. Then I push back on that by pointing out that this could be a “Neptune” situation instead of a “Vulcan” situation. Furthermore, I will point out that the theory does describe the part of the world that is relevant to the theory very accurately to the extend of no other. So, I will ask them: what do you propose as an alternative that explains all of this better? That question is also frequently ignored, but when push comes to shove, the answer essentially boils down to “goddidit with miracles. That explains everything”. That’s a whole lot of nothing to work with. In fact, that’s even worse than “no theory”. It’s just pretending you have a theory, which dulls any motivation to test, verify, build or improve upon any knowledge about the world. So, it remains preferable to keep and improve a well-established theory, even one that’s far from perfect.
2. Some remarks on comments
So let’s apply what I said previously to the main topic is about Galaxy formation. Scientists have formulated various models for how the first galaxies formed. However, they had very little direct data from that time period. So, remember what I said about how models are often incomplete due to limited knowledge? That’s exactly the case here. While it’s true that their previous guess was that the earliest galaxies formed later than the ones that are now detected, cosmologists generally have been very open about the fact that early star and galaxy formation isn’t well understood, because their best devices couldn’t see far enough. In fact, this was the one of the main reasons why they made the JWST in the first place!!
Now that the JWST made observations that weren’t expected from our previous models based on limited information, what do we see? Do we see scientists working to upend of all of cosmology? Or do we see them motivated to revise their understanding on galaxy formation based on the new data that will keep coming in? Well, @thoughtful giving this quote from Yan gives a good hint:
And then there is this:
This is the stuff I mentioned before that I find frustrating. Rationalizing any observation in an ad hoc fashion isn’t the same as making testable predictions. “He probably did it this way because we see it this way”. It’s a useless model, if one even can call it as such.
Uhm… “scientists will revise their models in light of new data”… isn’t really a remarkable prediction. Even more so, this has been a trend for the last decades. The following a short list of (former) record holders for most distant astronomical objects by the year of their discovery (By = billion years, My = Million years)
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Year 1998: Galaxy RD1 with z = 5.34 → 12.5 By ago or 1.300 By after big bang.
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Year 2002: Galaxy HCM-6A with z = 6.56 → 12.8 By ago or 1.0 By after big bang.
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Year 2006: Galaxy IOK-1 with z = 6.96 → 12.88 By ago or 920 My after big bang.
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Year 2015: Galaxy EGSY8p7 with z = 8.683 → 13.2 By ago or 600 Mya after big bang.
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Year 2016: Galaxy GN-z11 with z = 11 → 13.4 By ago or 400 My after big bang.
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Year 2022: Galaxy HD1 with z = 13.27 → 13.4418 By ago or 330 My after big bang.
More importantly, it’s NOT a prediction FOR creation or any potential alternative model. That should be the answer when one asks “What do creationists expect to find”? What Lisle is doing here is pushing rhetoric of “Scientists have been wrong before, so why should be believe them now?!” that I went over previously.
Besides, Lisle assertion of a young universe wouldn’t just mean that big bang cosmology is wrong, it would mean pretty much all of our modern understanding of physics is wrong. What’s more parsimonious explanation for (and a proper response to) new observations of earlier galaxies? That our models were incomplete and need to be updated? Or that pretty much everything we know about an entire field of science is wrong? Hint: It’s the former.
I have a better analogy. Or rather a literal example regarding the evolution of tetrapods. The oldest body fossils of tetrapods are about 377 million years old and we have many transitional “fishapods” are from around or just prior to that same time. Then we discovered trace fossils of tetrapods that are 390 million years old, which preceded many of the transitional fishapods as well. The creationists started mocking evolution as if our grandfather was born earlier than our great grandfather… of course not understanding that transitional ≠ ancestral such that transitional species can also coexist and even persist beyond the first members of a given clade. Think trees, not ladders.
This isn’t even an instance where a model is incomplete. The big bang model isn’t intended to explain this. It has little if anything to with how and exactly when galaxies formed, only being tangentially related under cosmology. Let’s be clear about what the big bang model is - or specifically the “hot big bang”. That “hot” is added to clarify it’s meaning since the “big bang” has confusingly different usages. The pop usage is that it refers to either the (tenseless) beginning (t=0) or the earliest phase of the universe (from t=0 to t>0). However, sometimes the ‘big bang’ is used more specifically to refer to a period when the universe was in a ‘hot and dense state’, which later expanded and cooled to become the largely cold universe that we currently inhabit. This period was preceded by inflation, meaning inflation isn’t part of the time frame designated as the ‘big bang’. This is how the term ‘big bang’ is used according to a physicist I am reading this from and also an online acquaintance who knows more than me about this. The reason why it’s called “hot” is because the universe was apparently “cold” and “empty” prior to this, due to the insane rate of cosmic expansion during inflation. At some point, the universe underwent a phase transition which halted inflation stopped through the ‘collapse’ of the energy that drove inflation. This collapse produced the particles and (re-)heating the universe. At least, that’s the best way I can describe this here. And from what I can tell, the details preceding period of inflation is still very much debated. Click on the previous link or this PBS Space Time video for more details.
So let’s just skip inflation and focus on the “hot big bang” for a moment, which approx started when the universe was 10^-32 seconds old (exact date also up for debate). From this time onward, what happened is very well agreed upon. We can actually directly test the conditions during this time in particle accelerators. The universe was so hot that matter only existed as a quark-gluon-plasma and the electromagnetic and weak nuclear forces were unified into an electroweak force. Then, at t=10^−12 seconds, a phase transition separated these forces into the 2 familiar ones and the Higgs field came into effect giving some particles their mass. But it was still too hot for quarks to associate. After t=10^−5 seconds, the universe was cool enough for quarks to form hadrons (incl. protons and neutrons). Now comes an important part. After 10 seconds, it cooled enough for the hadrons to form nuclei and until 20 minutes in, it was hot enough for nuclear fusion to occur (called Big Bang nucleosynthesis). This time interval predicts the relative amounts of hydrogen and helium isotopes we observe to day. Then another important thing happened. The universe remained hot enough for electrons to roam freely (everything was plasma, which kept scattering photons that made the universe opaque) until 18,000 years when the first neutral atoms formed through “recombination”. By 370,000 years, pretty much all matter had become neutral. This made the universe transparent for the first time, setting the photons free on a straight trajectory, which we can still see today as the Cosmic Microwave Background Radiation (CMB). It’s pretty much DIRECT evidence of the hot big bang. We can see the glow of the dense and hot universe, though it’s been red-shifted into microwaves. There is currently no other explanation for the CMB, and (for all intents and purposes) it’s pretty much the only possible explanation there can be.
That’s the basic idea of the (hot) big bang; which remains well-established. There are aspects that weren’t predicted from the classical big bang model (flatness, horizon, dark matter and dark energy). These things gave rise to the inflation hypothesis (step #2 of science, or a “Neptune” situation). However, the question of how and when galaxy formed does not affect the evidence for the hot big bang model in any way.
That Big bang diagram was made by NASA in 2006, probably when they thought the first stars formed 400 million years after the big bang. “Oh my, science was wrong before.” Don’t you think this non-argument ever gets old?