Archive for the ‘News’ Category

History in the Remaking — Göbekli Tepe

Posted: October 21, 2012 by phaedrap1 in Monuments, News
Tags: ,
A temple complex in Turkey that predates even the pyramids is rewriting the story of human evolution.
They call it potbelly hill, after the soft, round contour of this final lookout in southeastern Turkey. To the north are forested mountains. East of the hill lies the biblical plain of Harran, and to the south is the Syrian border, visible 20 miles away, pointing toward the ancient lands of Mesopotamia and the Fertile Crescent, the region that gave rise to human civilization. And under our feet, according to archeologist Klaus Schmidt, are the stones that mark the spot—the exact spot—where humans began that ascent.Standing on the hill at dawn, overseeing a team of 40 Kurdish diggers, the German-born archeologist waves a hand over his discovery here, a revolution in the story of human origins. Schmidt has uncovered a vast and beautiful temple complex, a structure so ancient that it may be the very first thing human beings ever built. The site isn’t just old, it redefines old: the temple was built 11,500 years ago—a staggering 7,000 years before the Great Pyramid, and more than 6,000 years before Stonehenge first took shape. The ruins are so early that they predate villages, pottery, domesticated animals, and even agriculture—the first embers of civilization. In fact, Schmidt thinks the temple itself, built after the end of the last Ice Age by hunter-gatherers, became that ember—the spark that launched mankind toward farming, urban life, and all that followed.

Göbekli Tepe—the name in Turkish for “potbelly hill”—lays art and religion squarely at the start of that journey. After a dozen years of patient work, Schmidt has uncovered what he thinks is definitive proof that a huge ceremonial site flourished here, a “Rome of the Ice Age,” as he puts it, where hunter-gatherers met to build a complex religious community. Across the hill, he has found carved and polished circles of stone, with terrazzo flooring and double benches. All the circles feature massive T-shaped pillars that evoke the monoliths of Easter Island.

Though not as large as Stonehenge—the biggest circle is 30 yards across, the tallest pillars 17 feet high—the ruins are astonishing in number. Last year Schmidt found his third and fourth examples of the temples. Ground-penetrating radar indicates that another 15 to 20 such monumental ruins lie under the surface. Schmidt’s German-Turkish team has also uncovered some 50 of the huge pillars, including two found in his most recent dig season that are not just the biggest yet, but, according to carbon dating, are the oldest monumental artworks in the world.

The new discoveries are finally beginning to reshape the slow-moving consensus of archeology. Göbekli Tepe is “unbelievably big and amazing, at a ridiculously early date,” according to Ian Hodder, director of Stanford’s archeology program. Enthusing over the “huge great stones and fantastic, highly refined art” at Göbekli, Hodder—who has spent decades on rival Neolithic sites—says: “Many people think that it changes everythingIt overturns the whole apple cart. All our theories were wrong.”

Schmidt’s thesis is simple and bold: it was the urge to worship that brought mankind together in the very first urban conglomerations. The need to build and maintain this temple, he says, drove the builders to seek stable food sources, like grains and animals that could be domesticated, and then to settle down to guard their new way of life. The temple begat the city.

This theory reverses a standard chronology of human origins, in which primitive man went through a “Neolithic revolution” 10,000 to 12,000 years ago. In the old model, shepherds and farmers appeared first, and then created pottery, villages, cities, specialized labor, kings, writing, art, and—somewhere on the way to the airplane—organized religion. As far back as Jean-Jacques Rousseau, thinkers have argued that the social compact of cities came first, and only then the “high” religions with their great temples, a paradigm still taught in American high schools.

Religion now appears so early in civilized life—earlier than civilized life, if Schmidt is correct—that some think it may be less a product of culture than a cause of it, less a revelation than a genetic inheritance. The archeologist Jacques Cauvin once posited that “the beginning of the gods was the beginning of agriculture,” and Göbekli may prove his case.

The builders of Göbekli Tepe could not write or leave other explanations of their work. Schmidt speculates that nomadic bands from hundreds of miles in every direction were already gathering here for rituals, feasting, and initiation rites before the first stones were cut. The religious purpose of the site is implicit in its size and location. “You don’t move 10-ton stones for no reason,” Schmidt observes. “Temples like to be on high sites,” he adds, waving an arm over the stony, round hilltop. “Sanctuaries like to be away from the mundane world.”

Unlike most discoveries from the ancient world, Göbekli Tepe was found intact, the stones upright, the order and artistry of the work plain even to the un-trained eye. Most startling is the elaborate carving found on about half of the 50 pillars Schmidt has unearthed. There are a few abstract symbols, but the site is almost covered in graceful, naturalistic sculptures and bas-reliefs of the animals that were central to the imagination of hunter-gatherers. Wild boar and cattle are depicted, along with totems of power and intelligence, like lions, foxes, and leopards. Many of the biggest pillars are carved with arms, including shoulders, elbows, and jointed fingers. The T shapes appear to be towering humanoids but have no faces, hinting at the worship of ancestors or humanlike deities. “In the Bible it talks about how God created man in his image,” says Johns Hopkins archeologist Glenn Schwartz. Göbekli Tepe “is the first time you can see humans with that idea, that they resemble gods.”

The temples thus offer unexpected proof that mankind emerged from the 140,000-year reign of hunter-gatherers with a ready vocabulary of spiritual imagery, and capable of huge logistical, economic, and political efforts. A Catholic born in Franconia, Germany, Schmidt wanders the site in a white turban, pointing out the evidence of that transition. “The people here invented agriculture. They were the inventors of cultivated plants, of domestic architecture,” he says.

Göbekli sits at the Fertile Crescent’s northernmost tip, a productive borderland on the shoulder of forests and within sight of plains. The hill was ideally situated for ancient hunters. Wild gazelles still migrate past twice a year as they did 11 millennia ago, and birds fly overhead in long skeins. Genetic mapping shows that the first domestication of wheat was in this immediate area—perhaps at a mountain visible in the distance—a few centuries after Göbekli’s founding. Animal husbandry also began near here—the first domesticated pigs came from the surrounding area in about 8000 B.C., and cattle were domesticated in Turkey before 6500 B.C. Pottery followed. Those discoveries then flowed out to places like Çatalhöyük, the oldest-known Neolithic village, which is 300 miles to the west.

The artists of Göbekli Tepe depicted swarms of what Schmidt calls “scary, nasty” creatures: spiders, scorpions, snakes, triple-fanged monsters, and, most common of all, carrion birds. The single largest carving shows a vulture poised over a headless human. Schmidt theorizes that human corpses were ex-posed here on the hilltop for consumption by birds—what a Tibetan would call a sky burial. Sifting the tons of dirt removed from the site has produced very few human bones, however, perhaps because they were removed to distant homes for ancestor worship. Absence is the source of Schmidt’s great theoretical claim. “There are no traces of daily life,” he explains. “No fire pits. No trash heaps. There is no water here.” Everything from food to flint had to be imported, so the site “was not a village,” Schmidt says. Since the temples predate any known settlement anywhere, Schmidt concludes that man’s first house was a house of worship: “First the temple, then the city,” he insists.

Some archeologists, like Hodder, the Neolithic specialist, wonder if Schmidt has simply missed evidence of a village or if his dating of the site is too precise. But the real reason the ruins at Göbekli remain almost unknown, not yet incorporated in textbooks, is that the evidence is too strong, not too weak. “The problem with this discovery,” as Schwartz of Johns Hopkins puts it, “is that it is unique.” No other monumental sites from the era have been found. Before Göbekli, humans drew stick figures on cave walls, shaped clay into tiny dolls, and perhaps piled up small stones for shelter or worship. Even after Göbekli, there is little evidence of sophisticated building. Dating of ancient sites is highly contested, but Çatalhöyük is probably about 1,500 years younger than Göbekli, and features no carvings or grand constructions. The walls of Jericho, thought until now to be the oldest monumental construction by man, were probably started more than a thousand years after Göbekli. Huge temples did emerge again—but the next unambiguous example dates from 5,000 years later, in southern Iraq.

The site is such an outlier that an American archeologist who stumbled on it in the 1960s simply walked away, unable to interpret what he saw. On a hunch, Schmidt followed the American’s notes to the hilltop 15 years ago, a day he still recalls with a huge grin. He saw carved flint everywhere, and recognized a Neolithic quarry on an adjacent hill, with unfinished slabs of limestone hinting at some monument buried nearby. “In one minute—in one second—it was clear,” the bearded, sun-browned archeologist recalls. He too considered walking away, he says, knowing that if he stayed, he would have to spend the rest of his life digging on the hill.

Now 55 and a staff member at the German Archaeological Institute, Schmidt has joined a long line of his countrymen here, reaching back to Heinrich Schliemann, the discoverer of Troy. He has settled in, marrying a Turkish woman and making a home in a modest “dig house” in the narrow streets of old Urfa. Decades of work lie ahead.

Disputes are normal at the site—the workers, Schmidt laments, are divided into three separate clans who feud constantly. (“Three groups,” the archeologist says, exasperated. “Not two. Three!”) So far Schmidt has uncovered less than 5 percent of the site, and he plans to leave some temples untouched so that future researchers can examine them with more sophisticated tools.

Whatever mysterious rituals were conducted in the temples, they ended abruptly before 8000 B.C., when the entire site was buried, deliberately and all at once, Schmidt believes. The temples had been in decline for a thousand years—later circles are less than half the size of the early ones, indicating a lack of resources or motivation among the worshipers. This “clear digression” followed by a sudden burial marks “the end of a very strange culture,” Schmidt says. But it was also the birth of a new, settled civilization, humanity having now exchanged the hilltops of hunters for the valleys of farmers and shepherds. New ways of life demand new religious practices, Schmidt suggests, and “when you have new gods, you have to get rid of the old ones.”

Author

Patrick Symmes

Iceland Swarm!!

Posted: October 21, 2012 by noxprognatus in News, videos

This swarm in Iceland is very unusual. I said more activity on the Mid-Atlantic ridge was coming, and Venezuela to get a large Earthquake. Stemming from the pressure originating fom the Antarctic.

Evidence of Viking Outpost Found in Canada

Posted: October 21, 2012 by phaedrap1 in News
Tags: ,

Sharpeners may be smoking guns in quest for New World’s second Viking site.

Archaeologists dig in the Tanfield Valley.

 

For the past 50 yearssince the discovery of a thousand-year-old Viking way station in Newfoundlandarchaeologists and amateur historians have combed North America’s east coast searching for traces of Viking visitors.

It has been a long, fruitless quest, littered with bizarre claims and embarrassing failures. But at a conference in Canada earlier this month, archaeologist Patricia Sutherland announced new evidence that points strongly to the discovery of the second Viking outpost ever discovered in the Americas.

 

While digging in the ruins of a centuries-old building on Baffin Island (map), far above the Arctic Circle, a team led by Sutherland, adjunct professor of archaeology at Memorial University in Newfoundland and a research fellow at the University of Aberdeen in Scotland, found some very intriguing whetstones. Wear grooves in the blade-sharpening tools bear traces of copper alloys such as bronze—materials known to have been made by Viking metalsmiths but unknown among the Arctic’s native inhabitants.

Taken together with her earlier discoveries, Sutherland’s new findings further strengthen the case for a Viking camp on Baffin Island. “While her evidence was compelling before, I find it convincing now,” said James Tuck, professor emeritus of archaeology, also at Memorial University.

picture: viking ship

 

Archaeologists have long known that Viking seafarers set sail for the New World around A.D. 1000. A popular Icelandic saga tells of the exploits of Leif Eriksson, a Viking chieftain from Greenland who sailed westward to seek his fortune. According to the saga, Eriksson stopped long enough on Baffin Island to walk the coast—named Helluland, an Old Norse word meaning “stone-slab land”—before heading south to a place he called Vinland.

In the 1960s two Norwegian researchers, Helge Ingstad and Anne Stine Ingstad, discovered and excavated the Viking base camp at L’Anse aux Meadows (map) on the northern tip of Newfoundland—the first confirmed Viking outpost in the Americas. Dated to between 989 and 1020, the camp boasted three Viking halls, as well as an assortment of huts for weaving, ironworking, and ship repair.

 

Viking Yarn

As reported in the November issue of National Geographic magazine, Sutherland first caught wind of another possible Viking way station in 1999, when she spotted two unusual pieces of cord that had been excavated from a Baffin Island site by an earlier archaeologist and stored at the Canadian Museum of Civilization in Gatineau, Quebec.

Sutherland noticed that the strands bore little resemblance to the animal sinew Arctic hunters twisted into cordage. The cords turned out to be expertly woven Viking yarn, identical in technique to yarn produced by Viking women living in Greenland in the 14th century.

The discovery prompted Sutherland to scour other museum collections for more Viking artifacts from Baffin Island and other sites. She found more pieces of Viking yarn and a small trove of previously overlooked Viking gear, from wooden tally sticks for recording trade transactions to dozens of Viking whetstones

The artifacts came from four sites, ranging from northern Baffin Island to northern Labrador, a distance of a thousand miles (1,600 kilometers). Indigenous Arctic hunters known as the Dorset people had camped at each of the sites, raising the possibility that they had made friendly contact with the Vikings.

Intrigued, Sutherland decided to reopen excavations at the most promising site, a place known as Tanfield Valley on the southeast coast of Baffin Island. In the 1960s U.S. archaeologist Moreau Maxwell had excavated parts of a stone-and-sod building there, describing it as “very difficult to interpret.” Sutherland suspected that Viking seafarers had built the structure.

Clues Etched in Bronze, Brass, and Iron

Since 2001 Sutherland’s team has been exploring Tanfield Valley and carefully excavating surviving parts of the mysterious ruins. They have discovered a wide range of evidence pointing to the presence of Viking seafarers: pelt fragments from Old World rats; a whalebone shovel similar to those used by Viking settlers in Greenland to cut sod; large stones that appear to have been cut and shaped by someone familiar with European stone masonry; and more Viking yarn and whetstones. And the stone ruins bear a striking resemblance to some Viking buildings in Greenland.

Still, some Arctic researchers remained skeptical. Most of the radiocarbon dates obtained by earlier archaeologists had suggested that Tanfield Valley was inhabited long before Vikings arrived in the New World. But as Sutherland points out, the complex site shows evidence of several occupations, and one of the radiocarbon dates indicates that the valley was occupied in the 14th century, when Viking settlers were farming along the coast of nearby Greenland.

In search of other clues to help solve the mystery, Sutherland turned to the Geological Survey of Canada. Using a technique known as energy dispersive spectroscopy, the team examined the wear grooves on more than 20 whetstones from Tanfield Valley and other sites. Sutherland and her colleagues detected microscopic streaks of bronze, brass, and smelted iron—clear evidence of European metallurgy, which she presented October 7 at a meeting of the Council for Northeast Historical Archaeology in St. John’s, Canada.

 

Norse-Native American Trade Network?

Sutherland speculates that parties of Viking seafarers travelled to the Canadian Arctic to search for valuable resources. In northern Europe at the time, medieval nobles prized walrus ivory, soft Arctic furs, and other northern luxuries—and Dorset hunters and trappers could readily stockpile such products. Helluland’s waters teemed with walruses, and its coasts abounded in Arctic foxes and other small fur-bearing animals. To barter for such goods, Viking traders likely offered bits of iron and pieces of wood that could be carved into figurines and other goods, Sutherland says.

If Sutherland is correct, the lines of evidence she has uncovered may point to a previously unknown chapter in New World history in which Viking seafarers and Native American hunters were partners together in a transatlantic trade network. “I think things were a lot more complex in this part of the world than most people assumed,” Sutherland said. James Tuck agreed. “It’s pretty convincing that there was a much larger Norse presence in the Canadian Arctic than any of us thought.”

 

Heather Pringle

National Geographic

Dolmen_at_ ale_stones

The remains of a 5,500-year-old tomb near Ale’s Stones, a megalithic monument where, according to myth, the legendary King Ale lies buried, has been discovered by Swedish archaeologists. The discovery is the product of a geophysical investigation of the area carried out in 2006.

Intrigued by a circular structure measuring about 165 feet in diameter with a rectangular feature in its center, archaeologists of the Swedish National Heritage Board decided to dig a trial trench.

“The outer circle was difficult to prove, but we did find vague traces at the spot, possibly imprints of smaller stones,” archaeologist Bengt Söderberg told Discovery News.

In the middle, the researchers found “several components” that are evidence of a dolmen, a megalithic portal tomb usually made of two vertical stones supporting a large flat horizontal stone on top.

“The components consisted of imprints of large stones belonging to a central grave chamber, which was surrounded by large stones and a brim of smaller stones,” Söderberg said.

Dolmen_stones_ at_ale_stones

Oriented north-south, the 65- by 26-foot dolmen dated to the Swedish early Neolithic period, about 5,500 years ago.

“We also found a blade, a scraper and some flakes of flint. This is not unusual when it comes to this type of graves,” Söderberg said.

According to archaeologist Annika Knarrström of the Swedish National Heritage Board, the dolmen was likely “the grave of some local magnate.”

“However, we have little data to really tell who was buried there,” Knarrström said.

The newly discovered dolmen lay just 130 feet from the spectacular Ales Stenar (“Ale’s Stones”), also known as “Sweden’s Stonehenge.”

Located near the fishing village of Kåseberga, the structure consists of 59 stones, each weighing up to 4,000 pounds, that appear to form a 220-foot-long ship overlooking the Baltic Sea.

Ales_stenar_kaseberga

Although some researchers argue that the stone formation was assembled 2,500 years ago, during the Scandinavian Bronze Age, most scholars agree that it dates back some 1,400 years, toward the end of the Nordic Iron Age.

Like Stonehenge, the enigmatic stone ship has raised many theories about its purpose. According to local folklore, it was the final resting place of a legendary leader known as King Ale. Other theories suggest it was an ancient astronomical calendar, a cemetery, or a monument to the Vikings. The newly discovered dolmen might provide new clues on the pre-history of the monument.

“Our findings confirm what we have long suspected: Some stone-built monuments might have stood on the ridge long before the Ale’s Stones,” Knarrström said.

The older stones, as well as those making the dolmen, were most likely reused to build the stone ship.

“This discovery also confirms our belief that the site must have attracted people in all times,” Knarrström said.

Photos: Top: Archaeologists clearing part of the trench with Ale’s Stones in the background. Credit: Annika Knarrström, Swedish National Heritage Board.

Middle: Detail from the west brim of the dolmen. Archaeologist Annika Knarrström puts a mark on one of the many small stones in the brim, after digitally measuring its position. Credit: Bengt Söderberg, Swedish National Heritage Board.

Bottom: Ale’s Stones, also known as “Sweden’s Stonehenge,” consists of 59 stones that appear to form a 220-foot-long ship overlooking the Baltic Sea near the fishing village of Kåseberga. Credit: Anders LageråsI/ Wikimedia Common

 

Discovery News

Cat leads owner to discovery of ancient Roman ruins

Posted: October 20, 2012 by phaedrap1 in News
Tags: ,

 

A cat led its owner into an ancient Roman tomb that may be 2,000 years old. (AFP/Reuters)Mirko Curti was chasing his cat through the streets of his village on Tuesday night when the cat inadvertently discovered a set of ancient Roman ruins.

“The cat managed to get into a grotto and we followed the sound of its meowing,” Curti told the Guardian.

When he caught up to the animal, it had crawled into an opening in the side of a cliff. Inside the opening, Curti stumbled upon a 2,000-year-old tomb “piled with bones” and ancient Roman urns.

The tomb was discovered just outside a residential area in the Roman city of Via di Pietralata.

Archeologists who were called to the site have speculated that it dates back to sometime between the 1st century B.C. and the 2nd century A.D.

Curti described the discovery as “the most incredible experience” of his life.

The archeologists said that recent rains in the area were likely responsible for exposing the tomb and noted that several other similar discoveries have been made in the area in recent years.

Eric Pfeiffer — Yahoo News

  • Images are most detailed ever taken of the planet
  • Planet was initially described as ‘notoriously bland’ by researchers
  • Scientists now believe weather patterns are constantly changing on the surface

In 1986, when Voyager swept past Uranus, the probe’s portraits of the planet were ‘notoriously bland,’ disappointing scientists, yielding few new details of the planet and its atmosphere, and giving it a reputation as a bore of the solar system.

However, researchers today revealed new images that reveal the planet is actually home to torrid and bizarre weather patterns unseen on any other planet.

Researchers used a new technique at the Keck Observatory to reveal in incredible detail the bizarre weather of the seventh planet from the sun.

The sharpest, most detailed picture of Uranus. The north pole of Uranus (to the right in the picture) is characterized by a swarm of storm-like featuresThe sharpest, most detailed picture of Uranus. The north pole of Uranus (to the right in the picture) is characterized by a swarm of storm-like features

THE ‘NOTORIOUSLY BLAND’ PLANET

Uranus is the seventh planet from the Sun, and is named after the ancient Greek deity of the sky Uranus (Ancient Greek: Οὐρανός), the father of Cronus (Saturn) and grandfather of Zeus (Jupiter).

Though it is visible to the naked eye like the five classical planets, it was never recognized as a planet by ancient observers because of its dimness and slow orbit.

It is similar in composition to Neptune, and both are of different chemical composition than the larger gas giants, Jupiter and Saturn.

Astronomers sometimes place them in a separate category called ‘ice giants’.

Like the other giant planets, Uranus has a ring system, a magnetosphere, and numerous moons – but is unique because it is tilted sideways.

The images reveal the planet’s deep blue-green atmosphere is thick with hydrogen, helium and methane, Uranus’s primary condensable gas.

Winds blow mainly east to west at speeds up to 560 miles per hour, in spite of the small amounts of energy available to drive them.

Researchers say the atmosphere is almost equal to Neptune’s as the coldest in our solar system with cloud-top temperatures in the minus 360-degree Fahrenheit range, cold enough to freeze methane.

‘My first reaction to these images was ‘wow’ and then my second reaction was WOW,’ says AURA’s Heidi Hammel, a co-investigator on the new observations and an expert on the atmospheres of the solar system’s outer planets.

‘These images reveal an astonishing amount of complexity in Uranus’s atmosphere.

‘We knew the planet was active, but until now much of the activity was masked by noise in our data.’

Large weather systems, which are probably much less violent than the storms we know on Earth, behave in bizarre ways on Uranus, said Larry Sromovsky, a University of Wisconsin-Madison planetary scientist who led the new study using the Keck II telescope.

The scalloped band of clouds near the planet’s equator may indicate atmospheric instability or wind shear: ‘This is new and we don’t fully understand what it means.

‘We haven’t seen it anywhere else on Uranus,’ said Sromovsky.

‘Some of these weather systems stay at fixed latitudes and undergo large variations in activity.

‘Others are seen to drift toward the planet’s equator while undergoing great changes in size and shape.

‘Better measures of the wind fields that surround these massive weather systems are the key to unraveling their mysteries.’

The team believe the primary driving mechanism for the strange weather must be solar energy because there is no detectable internal energy source.

‘But the sun is 900 times weaker there than on Earth because it is 30 times further from the sun, so you don’t have the same intensity of solar energy driving the system,’ said Sromovsky.

‘Thus the atmosphere of Uranus must operate as a very efficient machine with very little dissipation.

Previous images of Uranus, such as this one taken in January 2004, failed to spot the weather conditions.Previous images of Uranus, such as this one taken in January 2004, failed to spot the weather conditions.

‘Yet the weather variations we see seem to defy that requirement.’

The new Keck II pictures of the planet, according to Sromovsky, are the ‘most richly detailed views of Uranus yet obtained by any instrument on any observatory.

‘No other telescope could come close to producing this result.’

The images were released in Renoat a meeting of the American Astronomical Society’s Division of Planetary Sciences.

The team used used Keck II, located on the summit of Hawaii’s 14,000-foot extinct volcano Mauna Kea, to capture a series of images that, when combined, help increase the signal to noise ratio and thus tease out weather features that are otherwise obscured.

In two nights of observing under superb conditions, Sromovsky’s group was able to obtain exposures of the planet that provide a clear view of the planet’s cloudy features, including several new to science.

The group used two different filters in an effort to characterize cloud features at different altitudes.

Two telescopes at the W.M. Keck Observatory on Mauna Kea on the Big Island of Hawaii which were used to capture the new imagesTwo telescopes at the W.M. Keck Observatory on Mauna Kea on the Big Island of Hawaii which were used to capture the new images

‘The main objective was to find a larger number of cloud features by detecting those that were previously too subtle to be seen, so we could better define atmospheric motions,’

New features found by the Wisconsin group include a scalloped band of clouds just south of Uranus’s equator and a swarm of small convective features in the north polar regions of the planet, features that have never been seen in the southern polar regions.

‘This is a very asymmetric situation: There is certainly something different going on in those two polar regions.’

One possible explanation, is that methane is pushed north by an atmospheric conveyor belt toward the pole where it wells up to form the convective features observed by Sromovsky’s group.

‘Perhaps we will also see a vortex at Uranus’s pole when it comes into view,’ the researchers said.

The phenomena may be seasonal, Sromovsky notes, but the group has so far been unable to establish a clear seasonal trend in the winds of Uranus.

‘Uranus is changing,’ he says. ‘We don’t expect things at the north pole to stay the way they are now.

By Mark Prigg

UK experiences ‘weirdest’ weather

Posted: October 19, 2012 by phaedrap1 in News
Tags: ,

Rain showers in Portsmouth

The UK has experienced its “weirdest” weather on record in the past few months, scientists say. The driest spring for over a century gave way to the wettest recorded April to June in a dramatic turnaround never documented before.

The scientists said there was no evidence that the weather changes were a result of Man-made climate change. But experts from three bodies warned the UK must plan for periodic swings of drought conditions and flooding. The warning came from the Environment Agency, Met Office and Centre for Ecology & Hydrology (CEH) at a joint briefing in London. Terry Marsh, from the CEH, said there was no close modern precedent for the extraordinary switch in river flows. The nearest comparison was 1903 but this year was, he said, truly remarkable. What was also remarkable – and also fortunate – was that more people did not suffer from flooding. Indeed, one major message of the briefing was that society has been steadily increasing its resilience to floods. Paul Mustow, head of flood management at the Environment Agency, told BBC News that 4,500 properties had been flooded this year. “But if you look back to 2007 when over 55,000 properties were flooded, we were relatively lucky – if lucky is the right word – for the impacts we saw this summer,” he said. “The rainfall patterns affected different areas – and also there were periods of respite between the rain which lessened the impact.” Fast moving He said 53,000 properties would have been flooded this year without flood defences. In total, he said, 190,000 properties had received flood protection in recent years. Mr Mustow claimed that flood defences repaid their investment by a factor of 8-1 but admitted that continuing to invest would be a “challenge”, after government cuts to planned projects. But he said that new streams of joint funding from local authorities and private developers had allowed 60 schemes to happen that otherwise would not have gone ahead. He said: “We have to get our heads round the possibility now that we’re going to have to move very quickly from drought to flood – with river levels very high and very low over a short period of time. “We used to say we had a traditional flood season in winter – now often it’s in summer. This is an integrated problem – there’s no one thing that’s going to solve it. The situation is changing all the time.” But scientists present from the Met Office and CEH said not much could be read into the weird weather. Terry Marsh from CEH said: “Rainfall charts show no compelling long-term trend – the annual precipitation table shows lots of variability.” Sarah Jackson from the Met Office confirmed that it did not discern any pattern that suggested Man-made climate change was at play in UK rainfall – although if temperatures rise as projected in future, that would lead to warmer air being able to carry more moisture to fall as rain. She said that this year’s conditions were partly caused by a move to a negative phase of the North Atlantic Oscillation which would be likely to lead to more frequent cold, drier winters – like the 1960s – and also wetter summers for 10-20 years. “Longer term we will see a trend to drier summers but superimposed on that we will always see natural variability,” she said. Whatever happens with the weather, the Environment Agency expects that more and more people will be protected from floods and droughts thanks to water sharing between farmers, water transfer between water companies, and better management of leaks and demand. But Mr Mustow admitted that much more needed to be done to ensure that farmers did not increase flood risk with land drainage schemes and that developers and builders ensured that new developments allowed water to drain into the soil rather than flushing into the sewers.

BBC

By Roger Harrabin

Environmental Analyst

Spectacular Meteor Sparks Fireball Over California

Posted: October 18, 2012 by phaedrap1 in News, Science
Tags: ,
Fireball Over Belmont, CA
Wes Jones caught the fireball over Belmont, CA, at 7:44 PM PDT, Oct. 17, 2012, using the camera at http://astrobytes.net/AllSky3.html.
CREDIT: Wes Jones

A spectacular meteor lit up the sky over California Wednesday night (Oct. 17) just days before a highly anticipated meteor shower hits its peak this weekend.

The meteor put on a dazzling display over Northern California when it streaked across the sky at 7:44 p.m. PDT (0244 GMT), according to scientists at NASA’s Ames Research Center in Moffett Field. The subsequent fireball and sonic boom triggered a flood of reports by witnesses to local news stations and authorities, with accounts coming in from across San Francisco and the Bay Area, according to ABC’s KGO-TV news station.

“At 7:44:44 pm PDT this evening, a bright fireball was seen  in the San Francisco Bay Area,” scientists with Ames’ Cameras for Allsky Meteor Surveillance (CAMS) wrote in an update. The project is led by meteor expert Peter Jenniskens of the SETI (Search for Extraterrestrial Intelligence) Institute. “We are checking our CAMS camera results to see if we have a track. Biggest question at the moment is whether this ended over land or ocean.”

 

The celestial fireworks came just days ahead of this weekend’s Orionid meteor shower peak, which occurs overnight on Oct. 20 and 21. The meteor shower is created by bits of the famed Halley’s Comet as they hit Earth’s atmosphere and flare up in fiery display.

October 2012 Orionid Meteor Shower
The Orionids are remnants of Halley’s Comet scattered along its orbit, one of the finest meteor showers in the year. The meteors appear to radiate from a point just between Orion’s club and the Gemini twins’ feet, but may be seen anywhere in the sky.
CREDIT: Starry Night Software

NASA meteor expert Bill Cooke at the agency’s Marshall Space Flight Center in Huntsville, Ala., has said the 2012 Orionid meteor shower should create dozens of meteors an hour, weather permitting. Because the moon is just a few days past its dark, “new” phase, it won’t interfere with the weekend “shooting stars” show.

The Orionid meteor shower is one of two meteor displays created by Halley’s Comet, which makes one orbit around the sun every 76 years. The other is the Eta Aquarid meteor shower, which occurs in May. The two meteor showers are created when the Earth passes through streams of dust cast off from Halley’s Comet.

Editor’s Note: If you snapped a photo of Wednesday night’s dazzling meteor and would like to share it with SPACE.com, please send images, comments and your location info to managing Editor Tariq Malik at: tmalik@space.com.

You can follow SPACE.com Managing Editor Tariq Malik on Twitter @tariqjmalik and SPACE.com on Twitter @Spacedotcom. We’re also on Facebook & Google+

 

Huge Moon-Forming Collision Theory Gets New Spin

Posted: October 18, 2012 by phaedrap1 in News, Science
Tags: ,
Moon Born in Violence
This artist’s conception of a planetary smashup whose debris was spotted by NASA’s Spitzer Space Telescope three years ago gives an impression of the carnage that would have been wrecked when a similar impact created Earth’s Moon. A team at Washington University in St. Louis has uncovered evidence of this impact that scientists have been trying to find for more than 30 years. Image released Oct. 17, 2012.
CREDIT: NASA/JPL-Caltech

The moon did indeed coalesce out of tiny bits of pulverized planet blasted into space by a catastrophic collision 4.5 billion years ago, two new studies suggest.

The new research potentially plugs a big hole in the giant impact theory, long the leading explanation for the moon’s formation. Previous versions of the theory held that the moon formed primarily from pieces of a mysterious Mars-size body that slammed into a proto-Earth — but that presented a problem, because scientists know that the moon and Earth are made of the same stuff.

The two studies both explain how Earth and the moon came to be geochemical twins. However, they offer differing versions of the enormous smashup that apparently created Earth’s natural satellite, giving scientists plenty to chew on going forward.

A fast-spinning Earth

One of the studies — by Matija Cuk of the SETI (Search for Extraterrestrial Intelligence) Institute in Mountain View, Calif., and Sarah Stewart of Harvard — suggests the answer lies in Earth’s rotation rate.

If Earth’s day had been just two to three hours long at the time of the impact, Cuk and Stewart calculate, the planet could well have thrown off enough material to form the moon (which is 1.2 percent as massive as Earth).

This rotational speed might sound incredible, and indeed it’s close to the threshold beyond which the planet would begin to fly apart. But researchers say the early solar system was a “shooting gallery” marked by many large impacts, which could have spun planets up to enormous speeds.

Cuk and Stewart’s study, which appears online today (Oct. 17) in the journal Science, also provides a mechanism by which Earth’s rotation rate could have slowed over time.

After the collision, a gravitational interaction between Earth’s orbit around the sun and the moon’s orbit around Earth could have put the brakes on the planet’s super-spin, eventually producing a 24-hour day, the scientists determined.

A Massive Collision Creates the Moon
Simulation of an off-center, low-velocity collision between two protoplanets containing 45 percent and 55 percent of Earth’s mass. Color scales with particle temperature in kelvin, with blue-to-red indicating temperatures from 2,000 K to in excess of 6,440 K. After the initial impact, the protoplanets re-collide, merge and form a rapidly spinning Earth-mass planet surrounded by an iron-poor protolunar disk containing about 3 lunar masses. The composition of the disk and the final planet’s mantle differ by less than 1 percent.
CREDIT: Southwest Research Institute

A bigger impactor

Cuk and Stewart’s version of the cosmic smashup posits a roughly Mars-size impactor — a body with 5 percent to 10 percent the mass of Earth. However, the other new study — being published in the same issue of Science today — envisions a collision between two planets in the same weight class.

“In this impact, the impactor and the target each contain about 50 percent of the [present] Earth’s mass,” Robin Canup, of the Southwest Research Institute in Boulder, Colo., told SPACE.com via email.

“This type of impact has not been advocated for the Earth-moon before (although a similar type of collision has been invoked for the origin of the Pluto-Charon pair),” Canup added, referring to the largest moon of Pluto.

In her computer models, the symmetry of this collision caused the resulting moon-forming debris disk to be nearly identical in composition to the mantle of the newly enlarged Earth.

Canup’s models further predict that such an impact would significantly increase Earth’s rotational speed. But that may not be a big issue, since Cuk and Stewart’s work explains how Earth’s spin could have slowed over time.

A third study, published today in the journal Nature, determined that huge amounts of water boiled away during the moon’s birth. The finding, made by examining moon rocks brought back to Earth by Apollo astronauts, further bolsters the broad outlines of the giant impact theory.

Though the gigantic smashup occurred 4.5 billion years ago, scientists may one day be able to piece together in detail how it all went down, Canup said.

“Models of terrestrial planet assembly should be able to evaluate the relative probability of, e.g., the collision I advocate vs. the one proposed by Cuk and Stewart,” she said.

 

by Mike Wall, SPACE.com Senior Writer

Date: 17 October 2012

Angkor Wat

Angkor Wat’s heavy stones were likely transported along a complex canal network, according to a new study.

By Traci Watson

Scientists have long known that the sandstone blocks used to build the famous Angkor Wat temple and other monuments in the ancient Cambodian city of Angkor came from quarries at the foot of a sacred mountain nearby. But how did the 5 million to 10 million blocks, some weighing more than 1500 kilograms, reach Angkor? Researchers report in a paper in press at the Journal of Archaeological Science that when they examined Google Earth maps of the area, they saw lines that looked like a transportation network. Field surveys revealed that the lines are a series of canals, connected by short stretches of road and river, that lead from the quarries straight to Angkor. The roads and canals—some of which still hold water—would’ve carried blocks from the 9th century to the 13th century on a total journey of 37 kilometers or so. The researchers don’t know whether the blocks would’ve floated down the canals on rafts or via some other method. Scholars had previously assumed that the blocks were floated down a canal to the Tonle Sap Lake and then upstream on the Siem Reap River, a route of 90 kilometers. The newly reported canal network would’ve taken many months and thousands of laborers to construct, but it would have been all in a day’s work for Khmer engineers, whose elaborate reservoirs and other hydraulic works at Angkor still inspire awe.

 

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