Earth Regularly Trashed by Comets
Giant comets could pose danger to life on Earth
A team of astronomers from Armagh Observatory and the University of Buckingham report that the discovery of hundreds of giant comets in the outer planetary system over the last two decades means that these objects pose a much greater hazard to life than asteroids.
The team, made up of Professors Bill Napier and Duncan Steel of the University of Buckingham, Professor Mark Bailey of Armagh Observatory, and Dr David Asher, also at Armagh, publish their review of recent research in the December issue of Astronomy & Geophysics (A&G), the journal of the Royal Astronomical Society.
The giant comets, termed centaurs, move on unstable orbits crossing the paths of the massive outer planets Jupiter, Saturn, Uranus and Neptune. The planetary gravitational fields can occasionally deflect these objects in towards the Earth.
Centaurs are typically 50 to 100 kilometres across, or larger, and a single such body contains more mass than the entire population of Earth-crossing asteroids found to date. Calculations of the rate at which centaurs enter the inner solar system indicate that one will be deflected onto a path crossing the Earth’s orbit about once every 40,000 to 100,000 years. Whilst in near-Earth space they are expected to disintegrate into dust and larger fragments, flooding the inner solar system with cometary debris and making impacts on our planet inevitable.
Known severe upsets of the terrestrial environment and interruptions in the progress of ancient civilisations, together with our growing knowledge of interplanetary matter in near-Earth space, indicate the arrival of a centaur around 30,000 years ago. This giant comet would have strewn the inner planetary system with debris ranging in size from dust all the way up to lumps several kilometres across.
Specific episodes of environmental upheaval around 10,800 BCE and 2,300 BCE, identified by geologists and palaeontologists, are also consistent with this new understanding of cometary populations. Some of the greatest mass extinctions in the distant past, for example the death of the dinosaurs 65 million years ago, may similarly be associated with this giant comet hypothesis.
Professor Napier comments: "In the last three decades we have invested a lot of effort in tracking and analysing the risk of a collision between the Earth and an asteroid. Our work suggests we need to look beyond our immediate neighbourhood too, and look out beyond the orbit of Jupiter to find centaurs. If we are right, then these distant comets could be a serious hazard, and it’s time to understand them better."
The researchers have also uncovered evidence from disparate fields of science in support of their model. For example, the ages of the sub-millimetre craters identified in lunar rocks returned in the Apollo program are almost all younger than 30,000 years, indicating a vast enhancement in the amount of dust in the inner Solar system since then.
Tel: +44 (0)28 3752 2928
email@example.com / firstname.lastname@example.org
Professor Bill Napier
University of Buckingham
Tel (Ireland): +353 87361 8376
Professor Duncan Steel
University of Buckingham
Tel (New Zealand): +64 4889 0241
From the Royal Astronomical Society @ http://www.ras.org.uk/news-and-press/2758-giant-comets-could-pose-danger-to-life-on-earth
Falling meteor may have changed the course of Christianity
The biblical prequel to Chelyabinsk
(Image: Zuccari, Federico (1540/3-1609): Conversion of St Paul, 1563. Rome, San Marcello al Corso. © 2015. DeAgostini Picture Library/Scala, Florence)
The early evangelist Paul became a Christian because of a dazzling light on the road to Damascus, but one astronomer thinks it was an exploding meteor
William Hartmann, co-founder of the Planetary Science Institute in Tucson, Arizona, has a different explanation for what happened to Paul. He says the biblical descriptions of Paul’s experience closely match accounts of the fireball meteor seen above Chelyabinsk, Russia, in 2013.
Hartmann has detailed his argument in the journal Meteoritics & Planetary Science (doi.org/3vn). He analyses three accounts of Paul’s journey, thought to have taken place around AD 35. The first is a third-person description of the event, thought to be the work of one of Jesus’s disciples, Luke. The other two quote what Paul is said to have subsequently told others.
“Everything they are describing in those three accounts in the book of Acts are exactly the sequence you see with a fireball,” Hartmann says. “If that first-century document had been anything other than part of the Bible, that would have been a straightforward story.”
But the Bible is not just any ancient text. Paul’s Damascene conversion and subsequent missionary journeys around the Mediterranean helped build Christianity into the religion it is today. If his conversion was indeed as Hartmann explains it, then a random space rock has played a major role in determining the course of history (see “Christianity minus Paul“).
That’s not as strange as it sounds. A large asteroid impact helped kill off the dinosaurs, paving the way for mammals to dominate the Earth. So why couldn’t a meteor influence the evolution of our beliefs?
“If a large asteroid impact helped kill the dinosaurs, why couldn’t one influence the evolution of beliefs?”
Hartmann’s argument is possible now because of the quality of observations of the Chelyabinsk incident. The 2013 meteor is the most well-documented example of larger impacts that occur perhaps only once in 100 years. Before 2013, the 1908 blast in Tunguska, also in Russia, was the best example, but it left just a scattering of seismic data, millions of flattened trees and some eyewitness accounts. With Chelyabinsk, there is a clear scientific argument to be made, says Hartmann. “We have observational data that match what we see in this first-century account.”
Shaping history’s arc: the Chelyabinsk meteor (Image: RIA NovostiI/SPL)
The most obvious similarity is the bright light in the sky, “brighter than the sun, shining round me”, according to Paul. That’s in line with video from Chelyabinsk showing a light, estimated to be around three times as bright as the sun, that created quickly moving shadows as it streaked across the sky.
After witnessing the light, Paul and his companions fell to the ground. Hartmann says they may have been knocked over when the meteor exploded in the sky and generated a shock wave. At Chelyabinsk, the shock wave destroyed thousands of windows and knocked people off their feet.
Paul then heard the voice of Jesus asking why Paul, an anti-Christian zealot to begin with, was persecuting him. The three biblical accounts differ over whether his companions also heard this voice, or a meaningless noise. Chelyabinsk produced a thunderous, explosive sound.
Paul was also blinded, with one account blaming the brightness of the light. A few days later, “something like scales fell from his eye and he regained his sight”. Our common idiom for suddenly understanding something stems from this description, but Hartmann says the phrase can be read literally. He suggests that Paul was suffering from photokeratitis, a temporary blindness caused by intense ultraviolet radiation.
“It’s basically a bit of sunburn on the cornea of the eye. Once that begins to heal, it flakes off,” says Hartmann. “This can be a perfectly literal statement for someone in the first century who doesn’t really understand what’s happening.” The UV radiation at Chelyabinsk was strong enough to cause sunburn, skin peeling and temporary blindness.
Raj Das-Bhaumik of Moorfields Eye Hospital in London says the condition is common among welders whose eyes are exposed to bright sparks, but the symptoms aren’t exactly as Hartmann is suggesting. “You wouldn’t expect bits of the eye to fall off; I’ve not come across that at all,” he says. It’s possible that the thin skin of the eyelids could burn and peel off, he says, but that is unlikely to happen in isolation. “If this were a meteorite, I’m sure you’d have other damage as well.”
Mark Bailey of Armagh Observatory in the UK, who previously identified a Tunguska-like event in Brazil in the 1930s, says it’s worth analysing old texts for clues to ancient impacts – bearing in mind that accounts are shaped by what people knew at the time. “Sometimes that doesn’t make sense to us, but it does make sense if you can reinterpret it.” What does he think of Hartmann’s argument? “He does a very detailed analysis,” says Bailey.
“I would label it as informed speculation – Bill Hartmann is an excellent author,” says Cooke. “But like so many other things in the ancient past there is no real concrete evidence, no smoking gun.” And with no other accounts from the time to draw on, there is little additional evidence to confirm or disprove the idea.
A search for meteorites in and around Syria could prove fruitful – Chelyabinsk left small chunks all over the region – but even that would be inconclusive. “If a meteorite is discovered in modern Syria in the future, the first thing to test would be how long it’s been on the Earth and whether it could potentially be associated with such a recent fall,” says Bailey. But even with our best techniques, dating such a rock to the nearest hundred years would be difficult.
Even so, Hartmann believes we need to think seriously about the implications of his idea. “My goal is not to discredit anything that anybody wants to believe in,” he says. “But if the spread of a major religion was motivated by misunderstanding a fireball, that’s something we human beings ought to understand about ourselves.”
Christianity minus Paul
IF A falling meteor did inspire Paul’s conversion to Christianity (see main story), that makes a random event hugely important in the history of humanity. What if Paul hadn’t seen the fireball?
“Some scholars call Paul the second founder of Christianity,” says Justin Meggitt, a religious historian at the University of Cambridge. At the time, Christianity was a small offshoot of Judaism, but Paul helped preach a version of it that broke with Jewish law.
Paul wasn’t the only first-century missionary, and without him Christianity would probably still have separated from Judaism and spread around the world, says Meggitt. But Paul’s teachings have endured through the ages, and their absence would be felt.
“People’s interpretation of Paul is absolutely fundamental to some of the central figures of Christianity,” says Meggitt. For example, Martin Luther, who started the Protestant Reformation in 1517, was heavily inspired by Paul’s letters.
Specific predictions about how Christianity and world events would have unfolded without Paul’s influence are hard to make, says Meggitt, but “Christianity probably would be very different without him”.
This article appeared in print under the headline “Christianity’s meteoric rise”
From New Scientist @ https://www.newscientist.com/article/mg22630183.700-falling-meteor-may-have-changed-the-course-of-christianity?full=true#.VVNMhNNVhBd
For more information about cometary catastrophes see http://nexusilluminati.blogspot.com/search/label/comet%20venus
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