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17 days ago
JonnyMcA
HI Susan, As I understand it, a Calabi-Yau manifold is a mathematical topological construct used in Super string theory to describe how the extra spacial dimensions (required for the theory to work) curl upon themselves. The properties of these manifolds are such that they allow these extra postulated dimensions to be compact so that they are still outside the resolution of our measurement te
Forum: Science & Space
7 weeks ago
JonnyMcA
Hi Susan, In the strictest sense, the dating process measures the time of exposure of the surface of a rock. So where this comes into its strength is in geological processes. For example, imagine that in the distant past there was a land slide, such as The Storr formation on the Isle of Skye, which resulted from a rock slope failure. This event caused the underlying rocks to be exposed to c
Forum: Science & Space
2 months ago
JonnyMcA
QuoteI guess the point is though that Proxima Centauri offers really the only conceivable interstellar destination in a human lifetime or less given the limits of light speed. This is only partially true, as it depends upon whose lifetime you are referring to. In theory, one could travel thousands of light years within the span of a human lifetime as viewed from the relative inertial frame of
Forum: Science & Space
2 months ago
JonnyMcA
All that we can conclude from the research is that calibrated radiocarbon measurements tell us that the Dixon wood most probably last grew in the period 3341-3094 BC. It does not actually tell us anything other than the fact that the pyramid most probably would not have been built before this period. There are a number of reasons why the wood apparently pre-dates the accepted c.2500 BC cons
Forum: Mysteries
2 months ago
JonnyMcA
It is not at all unusual for amateurs to have access to astronomical scientific data. The reason is that most, if not all, data obtained by governmental agencies, such as NASA or ESA are freely accessible, either immediately or after a short embargo period, to the general public. In the case of the GAIA mission operated under the umbrella of the ESA, this data could be downloaded and analysed
Forum: Science & Space
3 months ago
JonnyMcA
Hi Susan, The star in question (2MASS 19281982-2640123), is around 1800 light years from us, which means that if teh signal did indeed originate from there, it would have taken 1800 years to reach us. Jonny
Forum: Science & Space
11 months ago
JonnyMcA
Hi David, I took the liberty of calibrating the two radiocarbon dates using IntCal13 and OxCal. This will give you the 1-sigma and 2-sigma spread of calendar dates for the two sample results. The results are below. Results for radiocarbon age of 10143 +/- 50 radiocarbon years BP. Results for radiocarbon age of 8721 +/- 50 radiocarbon years BP. Jonny
Forum: Mysteries
1 year ago
JonnyMcA
The 4.2 kyr event would seem to be to far removed from the 2350 BC event (and hence the collapse of the Malta culture)for them to be a symptom of the same climatic event (though in our paper we do note that perhaps there is a common cosmic vector, but this could of course be entirely incorrect, and I would not be surprised if this is the case). Mendelkher's compilation of events that occurred
Forum: Mysteries
1 year ago
JonnyMcA
The Smithsonian Channel did a documentary on this last year (Sacred Sites: Malta), where they interviewed Caroline Malone (amongst others). While the article posits that the collapse of the culture around 2350 BC was perhaps due to the climatic effects of a large volcanic eruption (or more accurate to say, radiocarbon date ranges for the collapse of the culture coincide with the precise tree r
Forum: Mysteries
1 year ago
JonnyMcA
They are a type of small bearded star, often with pick axes, that wander through the galaxy singing "Hi Ho" and complaining about their poor working conditions and contracts. Jonny
Forum: Science & Space
1 year ago
JonnyMcA
It's also worth pointing out that although light cannot be accelerated if you do try to alter it's speed (which can be thought of as an "acceleration"), you change the energy which results in either a red shift or blue shift of the wavelength of the light. If we think of it in terms of classical electromagnetism, a ray of light moving away from a black hole has to climb out of the
Forum: Science & Space
1 year ago
JonnyMcA
It seems to me that the Hiwatha crater may be filled with Eemian ice (that is ice laid down before the last ice age) and so it would be at least around 100 ka old, and certainly older than the Younger Dryas). see for example the radar maping of ice in this video from around 1 min 30 onwards Jonny
Forum: Science & Space
2 years ago
JonnyMcA
Hi Ivano, yes indeed, the tide of argument is shifting again upon the date of Thera, and it does look as if the Old Vs young debate is going to be resolved especially if the single year radiocarbon measurements showing an error in the radiocarbon calibration curve is independently replicated. In this case it will mean that the radiocarbon dates are too old, and that the real dates are closer
Forum: History
2 years ago
JonnyMcA
Hi Kristin, I can see where some confusion lies. In our paper we have revised the GICC05 timescale (which was constructed from three ice cores-Dye3, GRIP and NGRIP-and to complete the circle, mapped back on to each individual ice core, and also onto the NEEM ice core in 2013) back to around 2000 BC. This is the same timescale which in 2015 we showed had a 7 year error during most of the 1st
Forum: History
2 years ago
JonnyMcA
Hi Susan, You are correct, evidence cannot be inserted into the ice, but that doesn't mean to say that evidence cannot be misinterpreted, or indeed, presumed. The prime example of this is in the original assertion that the ice core workers had found the AD 79 eruption of Vesuvius in their ice cores, as well as assuming they had found the historical eruption of Hekla in AD 1104, which they the
Forum: History
2 years ago
JonnyMcA
A new paper by myself and Mike Baillie revises the Greenland ice core chronologies back to around 2000 BC. We show that the massive climate dislocation beginning in 1627 BC, a date that has been associated with the eruption of the Mediterranean volcano of Thera (modern day Santorini), was actually caused by the caldera forming eruption of Aniackchak in Alaska. Furthermore, we find poor agreement
Forum: History
2 years ago
JonnyMcA
The news article is unfortuantely inaccurate in many respects QuoteA mysterious fog plunged Europe, the Middle East, and parts of Asia into darkness, day and night—for 18 months. "For the sun gave forth its light without brightness, like the moon, during the whole year," wrote Byzantine historian Procopius. The Science article carries the implication that the sun was completely dar
Forum: History
2 years ago
JonnyMcA
Hi Pete, I am not sure if the 774 event had an impact upon global climate in that year, and I dont think that it is likely that it influenced teh climate two decades later. Certainly, tree ring data suggests that 774 was a cold year, but one needs to be careful in assuming a causal link. As to what caused famines and crop failures two decades later, it is difficult to say. There does seem
Forum: Science & Space
2 years ago
JonnyMcA
Yes indeed I was. I was trying to fit a supernova to the 774 or 993 events, but it was not terribly convincing given the fact that the events have the same characteristics, and so it seemed unlikely that we would have no record of two close supernovae in the historical records. Jonny
Forum: Science & Space
2 years ago
JonnyMcA
Hi Kristin, As mentioned above the general consensus is that these events are solar in origin and not due to a close supernova as had been conjectured shortly after their discovery. Jonny
Forum: Science & Space
2 years ago
JonnyMcA
Hi Daniel, I had no involvement in the paper, though I did read an early draft of it. The consensus for the origin of these radiocarbon excess events is one (or more) Solar Proton Events. See for example Usoskin et al. (2013). It had been conjectured that a close gamma ray burst or supernova may have been the cause, but such events do not appear to have the correct radiation spectrum to g
Forum: Science & Space
2 years ago
JonnyMcA
AKA Dendrochronology works on a global scale! In an unprecedented collaboration of tree ring and radiocarbon researchers around the world have come together to investigate the AD 774 and 993 radiocarbon excess. In a nutshell they find that tree ring records accurately cross date globally and that the 774 and 993 cosmic events are recorded coherently in each chronology, with the events lik
Forum: Science & Space
2 years ago
JonnyMcA
Another link that discusses the debunking of the Mohenjo Daro nucelear catastrophe. Jonny
Forum: Paranormal & Supernatural
2 years ago
JonnyMcA
If you are wanting a link to what I am talking about in the Malta documentary you can read my paper on the so called 2350 BC event here . While that paper links to the so called 4.2kya event (a 2-3 century climatic anomaly that lasted from around 2200 BC to around 2000-1900 BC), it does discuss the background of the 2350 BC event which was first identified in Irish Tree rings in the 1990s.
Forum: Mysteries
2 years ago
JonnyMcA
Hi Dr T, I am glad you enjoyed it. I have not seen it myself, but it is nice to see that I have survived the editing. Jonny
Forum: Mysteries
2 years ago
JonnyMcA
see here Jonny
Forum: Mysteries
2 years ago
JonnyMcA
For those in America with access to the Smithsonian Channel, the program Sacred Sites is doing an episode on the megalithic temples of Malta on the 3rd September, which appear to have been abandoned in the mid 24th century BC. The program will touch upon the idea that the abandonment may have been due to climatic effects caused by an impact event around 2350 BC (see my our paper here for example
Forum: Mysteries
2 years ago
JonnyMcA
A nice news article on the paper Jonny
Forum: History
2 years ago
JonnyMcA
Hi Andy, Regarding my posts above see here for an update on the dating of Thera Jonny
Forum: History
2 years ago
JonnyMcA
Thanks Dr T. There is much exciting work on the go by a number of research groups in this area. We are slowly moving towards a better understanding of history. Jonny
Forum: History
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