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The "Glass Worm"
Contents of this pageIntroduction to the Glass WormMars is a weird place. No one argues that. I think the argument might be over just how weird Mars is. For example, does Mars host a species of giant glass worms, 50 meters across and kilometers long?I'm guessing no.
On Hoagland's website, he has a page about all this written by Ron Nicks, who claims to be a geologist. Nicks makes lots of claims about this feature, and in fact says the following:
[Note added March 30, 2004: In the original version of this article, I said that Ron Nicks was concluding this feature was an actual living worm at some point in the past. I was wrong. He does not say this in reality; he actually says that the lack of food for something this size precludes a natural biological origin for it (he does claim it is some sort of construction project, though). When I read the article, I misread that statement. However, this doesn't negate the other points I make below, especially the key one about optical illusions.]
Nicks' description is wrong in almost every detail he describes.
Now, most people looking at the image would certainly agree with
Nicks' analysis at first. I mean, it does look like a worm!
It looks so much like a worm that no less a figure than
Arthur C. Clarke has commented on it.
In I will state here that I am a great fan of Sir Arthur's. His stories helped inspire me to be an astronomer. It is not too much of a stretch to say that we owe our very presence in space to Arthur C. Clarke! But I think that in this case, I must disagree with him. This thing isn't a worm at all, and in fact has few of the properties ascribed to it by Nicks (speaking for Hoagland by proxy) and others. The Convex/Concave ConFirst off, they claim the object is convex, that is, popping out of the image as opposed to being a concave valley. However, I think this claim is false. To see why, look at the images below. They demonstrate an illusion where craters can look like domes if flipped upside-down.
This illusion is pretty cool, though some people have a harder time seeing it than others. Ironically, it is not all that strong to me in the pictures above, but my wife thought it was remarkable how much the image on the left looked like a dome. I have seen other examples, though, and this illusion can be pretty convincing. But does it work for the worm? Let's see:
As far as I am concerned, this makes it pretty clear right away that Nicks' (and therefore Hoagland's) claims about this feature are completely wrong. If it's not a convex tube, then everything else he says is perforce wrong. Whatcha Dune?But the transverse features are still odd-looking. What are they? Well, to me they look like sand dunes. Mars is a very sandy place, and has lots of wind. I've spent some time on beaches, and I know that wind + sand = sand dunes. In fact, Mars is littered with sand dunes. That does not necessarily mean these features are definitely sand dunes, but it's the most likely explanation. Of course, a lot of pseudoscientists are saying these features cannot be dunes. Nicks says this in his page on Hoagland's site. On that page, he actually says he tries to be fair, and includes comments from someone saying that these are dunes. Nicks then dismisses that, saying that the winds could not possibly follow along the winding formation. But he's saying that because he thinks it's raised above the surface, convex, and not a channel. Sure, if that feature were a long windy worm coming up out of the surface, no wind could blow along it. But it's not a worm, it's a carved depression in the surface. Winds can easily flow into and down such a channel, following the winding, meandering depression. That would naturally form dunes.
Not that this has stopped Hoagland, of course. On his website, in a page about the Face, he mentions this "worm" again, and says:
It's not simplistic, it's simple. Ironically, Hoagland is complaining that scientists tend to cling to ideas. Yet he is the one clinging to this being a convex feature, when it just ain't. So his whole premise is wrong from the very start. I feel that I should also mention that there is another explanation for these features. To me, they look like ridges you get in stream beds. As water flows, it naturally generates ridges like these, similar to the annoying ridges you get in dirt roads that make your car vibrate when you drive over them. I am not saying this is more or less likely than the ridges being dunes, but it is an alternate explanation. I'm not a geologist, so I cannot say one way or the other. Maybe I'll suggest it to one of the Mars scientists, and see what they say. It's better than idly speculating, and is far more likely to yield better results. Pane in the Glass
What about the glassy appearance of the "worm"?
Nicks makes this point a few times
in his writing, and
other pseudoscience websites have talked about this as well.
There are some bright features that look
like sunglints, reflections of off a shiny object. But there is another
explanation.
I think that is the case here as well. I took the image and played with
it just a bit in Photoshop. I made the image red, and changed the contrast a
little. Suddenly, the "glassy" appearance is gone, and
it looks more like what it really is: a long winding channel with
ridges. This in itself shows that the interpretation of glassiness
depends on how the image is displayed, and not necessarily on any
intrinsic shininess of the feature.
ConclusionSo what have I shown? Let's be clear:
So what we have here is yet another breathless claim by Hoagland and his team which, when you think more carefully about it, is grossly exaggerated at best. This isn't the fossil of some giant glass worm. It's even more remarkable, in my opinion: it's evidence that water once flowed on an alien planet. That is a fossil record of far greater interest. I've said it before and I'll say it again: the Universe is an incredible place, fantastic enough that we don't have to make up nonsense about it.
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