Pacific spike alert

One thing that drives me crazy is the tendency of the woo-woos to take a perfectly legitimate, valid piece of science, and then woo all over it.

The latest example of this is one you might have heard about.  Scientists doing isotopic analysis of cored sediments from the Pacific seabed found an unusual spike of an isotope called beryllium-10.  Beryllium-10 is mainly produced by cosmic rays colliding with oxygen and nitrogen atoms in the upper atmosphere; the beryllium atoms then gradually settle, creating what should be a uniform deposition in terrestrial and marine sediment layers.  Beryllium-10 is also radioactive, decaying into boron-10, so the relative concentrations of these two atoms, along with beryllium-10's known 1.4 million year half-life, allows for a convenient way to date sediment layers.

That, of course, presupposes that the formation and deposition rate of beryllium-10 is uniform, and cores from the Pacific seafloor from around ten million years ago show that, for a short time at least, this wasn't true.  These strata, from the mid-Miocene Epoch, showed up with an anomalous spike of beryllium-10.  What caused this isn't certain; two possibilities the researchers suggested were a shift in oceanic currents near Antarctica, causing an alteration in sediment distribution rate, or a nearby supernova producing a higher-than-normal influx of cosmic rays for a time.  In any case, the spike eventually leveled off, and the rest of the core sample was unremarkable, at least in that regard.

Well, "radioactive sediments" and "cosmic rays" and "anomaly" were apparently all it took.  In the past two weeks, since the paper was published, I've seen the following:

• the beryllium-10 spike is the debris from the reactor core of an exploded alien spacecraft, so add this to the list of "evidence for Ancient Astronauts."
• time-traveling government operatives went back to the Miocene to conduct illegal tests of nuclear superweapons so they could get away with it without anyone finding out, except apparently for this wingnut.
• the Sun had a "flare-up" ten million years ago that caused this.  This same phenomenon also caused all of the Earth's major mass extinctions.  It will happen again, and why is NASA covering this up?
• it's all a smokescreen to hide radioactive contamination that's actually from the Fukushima Reactor disaster.
• something something something HAARP something weather modification wake up sheeple something something.

Okay, will all of you lunatics just hang on a moment?

First of all, let's look at the actual spike the paper discusses.

[Image from Koll et al., Nature Communications, 10 February 2025]

See that wee bump at about ten million years?  That's the anomaly.  It's peculiar, sure, and cool that the scientists are trying to find out what caused it.  But it's a slightly higher-than-expected amount of a single isotope, and that's all.  They have even proposed some nifty uses for the discovery -- detecting the spike in sediment layers elsewhere could help to pinpoint how old they are -- but it's not, honestly, all that dramatic otherwise.  It doesn't correlate with a mass extinction (so cross out the Sun-induced extinction events), there are no other anomalous isotopes that show up at the same time (eliminating the superweapons and the ancient spacecraft, unless the aliens constructed their entire ship from beryllium-10), and it dates to ten million years ago (so it has nothing to do with Fukushima).

And HAARP was decommissioned in 2014, so all y'all conspiracy theorists can just shut the hell up about it, already.

I mean, really.  Isn't the actual science cool enough for them?  Why does everything have to fold into these people's favorite weird idea?

I suppose, as I saw a friend post a while ago, "Everything's a conspiracy if you don't understand how anything works."  But in these times when everyone's got a website, and "I read it on the internet" is considered by a lot of people to be the modern equivalent of "I have a Ph.D. from Cambridge in the subject," it's maddening how quickly these ideas spread -- and how little it takes for the wacko interpretations to eclipse the actual science.

So that's our dive into the deep end for today.  Beryllium spikes and ancient astronauts.  Me, I'm gonna stick with the scientific explanations.  Better than worrying about NASA covering up that we're all about to get fried by a "solar flare-up."

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Looking for Martians

When I first read C. S. Lewis's book Out of the Silent Planet, when I was in high school, one of the things that struck me was his vision of life on Malacandra -- what we here on Earth call Mars.

Malacandra, Lewis tells us, is evolved sentient life much earlier than the Earth did, and is therefore approaching the end of its habitability -- the planet is cooling (the majority of its surface is too cold, and the air far too thin, to support life), and its three species of intelligent life have retreated to the deepest parts of the canyons, where the hot springs keep things comfortable.  Given that this is Lewis, there are supernatural overtones to the story, and it's a rollicking good adventure, but what stuck with me most is his vision of a planet that is dying.  Just about every other science fiction novel or movie or television show at the time seemed to picture things as static -- whatever the civilization was, it was just kind of there.  You got the impression things could go on that way forever.

Lewis, on the other hand, recognized not only that organic life forms evolve, but that the planets they live on change as well, and not just in relatively minor ways such as the arrangement of the continents and the depth of the oceans and the presence or absence of ice caps.  The entire planet can shift in such a way as to become uninhabitable -- and, as Lewis points out, that will be the ultimate fate of the Earth as well.

Mars just happened to be closer to the end than we are.

[Image licensed under the Creative Commons ESA - European Space Agency & Max-Planck Institute for Solar System Research for OSIRIS Team ESA/MPS/UPD/LAM/IAA/RSSD/INTA/UPM/DASP/IDA, OSIRIS Mars true color, CC BY-SA 3.0 IGO]

The truth of Lewis's vision has been realized lately in our discovery that long ago, Mars was warm enough to have liquid water and a significant atmosphere.  And this week, a paper came out in Nature Communications that analyzes date from the HiRISE camera on board NASA’s Mars Reconnaissance Orbiter showing that Mars's rivers and oceans left behind layers of sedimentary rock -- a site where future exploration might look for fossils of Martian life.

"Unfortunately we don’t have the ability to climb, to look at the finer-scale details, but the striking similarities to sedimentary rocks on Earth leaves very little to the imagination," said lead author Francesco Salese, from Utrecht University in the Netherlands, in a press release.   "To form these 200-metre-thick deposits we needed conditions that would have required an environment capable of maintaining significant volumes of liquid water."

What this means is that not only was it warmer, the atmosphere was thicker.  The current thin atmosphere on Mars's surface means the pressure is low enough that water would evaporate away post-haste.  A billion years ago, Mars's climate was a great deal more like Earth's is today, but why the change happened isn't known.

I doubt it was the evil eldil from Thulcandra smiting the planet with his mighty fist, but otherwise, Lewis's picture of Mars's evolution toward the dead world it currently is was remarkably prescient.

"We’ve never seen an outcrop with this amount of detail on it that we can definitely say is so old,” said study co-author Joel Davis, postdoctoral researcher at the Natural History Museum in London.  "This is one more piece of the puzzle in the search for ancient life on Mars, providing novel insight into just how much water occupied these ancient landscapes...  The rivers that formed these rocks weren’t just a one-off event — they were probably active for tens to hundreds of thousands of years."

I hope this will spur us to launch more projects with landers that can excavate and analyze these rocks, looking for (amongst other things) fossils.  What we can do remotely, albeit amazing, is still pretty rudimentary -- we can't launch an electron microscope into space yet -- but even a preliminary analysis of the sedimentary layers could produce some fascinating results.

Unfortunately, even if further exploration will discover traces ancient Martian life, I doubt they'll resemble Lewis's hrossa, séroni, and pfifltriggi.  A pity.  Those things were pretty cool.

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This week's Skeptophilia book recommendation is about a phenomenal achievement; the breathtaking mission New Horizons that gave us our first close-up views of the distant, frozen world of Pluto.

In Alan Stern and David Grinspoon's Chasing New Horizons: Inside the Epic First Mission to Pluto, you follow the lives of the men and women who made this achievement possible, flying nearly five billion kilometers to something that can only be called pinpoint accuracy, then zinging by its target at fifty thousand kilometers per hour while sending back 6.25 gigabytes of data and images to NASA.

The spacecraft still isn't done -- it's currently soaring outward into the Oort Cloud, the vast, diffuse cloud of comets and asteroids that surrounds our Solar System.  What it will see out there and send back to us here on Earth can only be imagined.

The story of how this was accomplished makes for fascinating reading.   If you are interested in astronomy, it's a must-read.

[Note: if you purchase this book using the image/link below, part of the proceeds goes to support Skeptophilia!]