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New evidence points towards water on Moon

September 19, 2009 By admin Leave a Comment

London, September 19 (ANI): Two separate lunar missions have found evidence which indicates that the polar regions of the moon are chock full of water-altered minerals.

According to a report in Nature News, early results from NASA’s Lunar Reconnaissance Orbiter (LRO), launched on June 18, are offering a wide array of watery signals.

The Moon, in fact, has water in all sorts of places: not just locked up in minerals, but scattered throughout the broken-up surface, and, potentially, in blocks or sheets of ice at depth.

“We are on the verge of a renaissance in our thinking about the poles of the Moon, including how water ice gets there,” said Anthony Colaprete, principal investigator for the Lunar Crater Observation and Sensing Satellite (LCROSS), which on October 9, will slam into a polar crater with the intention of ploughing up a plume of water ice for many telescopic eyes to see.

The initial LRO results confirm what was long suspected as a way for ice to stay trapped on the Moon for billions of years.

A thermal mapping instrument showed that permanently shadowed regions within deep polar craters are as cold as 35o Kelvin (-238o Celsius).

Project scientist Richard Vondrak said that they are the coldest spots in the Solar System – even colder than the surface of Pluto.

Variations in the flux of neutrons suggests variability in water content among craters.

But, the surprise comes from a different instrument on LRO, which counts slow-moving neutrons as a way of measuring hydrogen abundance in the top metre or so of the surface.

This hydrogen is often interpreted as a proxy for water ice, although it could also be molecular hydrogen or hydrogen trapped in other molecules.

The LRO instrument has already found a significant excess of hydrogen at the poles.

But, with added resolution, it is seeing surprising variability within the polar regions. Some of the craters appear enriched in hydrogen. Others are not.

Stranger still, some areas outside the crater walls, which were thought to get too hot for water to linger, show an excess of hydrogen.

Vondrak said this shows that the water could have arrived more recently, or that it can persist if buried as impacts till the lunar soil.

If the LCROSS impact spews up ice, it will eliminate the last vestiges of doubt about water on the Moon.

It could also start a new hunt: to find a record of impact events, such as water-rich comet strikes, that put the ice there in the first place. (ANI)

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Scientists map melting history of Greenland’s ice sheet

September 17, 2009 By admin Leave a Comment

Washington, September 17 (ANI): Researchers from the Niels Bohr Institute at the University of Copenhagen have mapped the history of the melting of the Greenland ice sheet.

Numerous drillings have been made through both Greenland’s ice sheet and small ice caps near the coast.

By analyzing every single annual layer in the kilometres long ice cores, researchers can get detailed information about the climate of the past.

But now, the Danish researcher Bo Vinther and colleagues from the Centre for Ice and Climate at the Niels Bohr Institute, University of Copenhagen, in collaboration with researchers from Canada, France and Russia, have found an entirely new way of interpreting the information from the ice core drillings.

“Ice cores from different drillings show different climate histories. This could be because they were drilled at very different places on and near Greenland, but it could also be due to changes in the elevation of the ice sheet, because the elevation itself causes different temperatures,” explained Bo Vinther about the theory.

Today, the ice sheet is more than three kilometres thick at its highest point and thinning out towards the coast.

Four of the drillings analyzed are from the central ice sheet, while two of the drillings are from small ice caps outside of the ice sheet itself.

By comparing the Oxygen-18 content in all of the annual layers from the four drillings through the ice sheet with the Oxygen-18 content of the same annual layers in the small ice caps, Bo Vinther has calculated the elevation course through 11,700 years.

Just after the ice age the elevation of the ice sheet rose slightly because when the climate transitions from ice age to warm age, there is a rapid increase in precipitation.

But at the same time, the areas lying near the coast begin to decrease in size, because the ice is melting at the edge.

When the ice melts at the edge, it slowly causes the entire ice sheet to ‘collapse’ and become lower.

The calculations show that in the course of about 3,000 years, the elevation changed and became up to 600 meters lower in the coastal areas.

But in the middle, it was a slow process, where the elevation decreased around 150 meters in the course of around 6,000 years.

It then stabilized.

The new results show the evolution of elevation of the ice sheet throughout 11,700 years and they show that the ice sheet is very sensitive to the temperature.

The results can be used to make new calculations for models predicting future consequences of climate changes. (ANI)

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Mel Gibson’s pregnant lover craves for ice cream, olives

September 17, 2009 By admin Leave a Comment

Washington, Sept 16 (ANI): Actor Mel Gibson’s pregnant girlfriend craves for ice cream and olives.

Russian singer Oksana Grigorieva, who is due to give birth to the couple’s first baby in December, has revealed that she can’t stop eating sweet and salty foods.

“I’ve eaten a lot of ice cream. I eat ice cream and then I eat olives. It’s very strange,” Contactmusic quoted her as saying.

Grigorieva, who has a 12-year-old son, Alexander, from a previous relationship is happy to reveal her cravings, however, remains mum on the sex of the baby.

“Well, it’s definitely going to be one of those! I guess we’ll find out soon enough. We’re going to keep it private,” she said. (ANI)

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Cracks on Mars a result of evaporating lakes in ancient times

September 17, 2009 By admin Leave a Comment

Washington, September 16 (ANI): Networks of giant polygonal troughs etched across crater basins on Mars have been identified as desiccation cracks caused by evaporating lakes, providing further evidence of a warmer, wetter Martian past.

The findings were presented at the European Planetary Science Congress by PhD student M. Ramy El Maarry of the Max Planck Institute for Solar System Research.

The polygons are formed when long cracks in the surface of the Martian soil intersect.

El Maarry investigated networks of cracks inside 266 impact basins across the surface of Mars and observed polygons reaching up to 250 meters in diameter.

Polygonal troughs have been imaged by several recent missions but, until now, they have been attributed to thermal contractions in the Martian permafrost.

El Maarry created an analytical model to determine the depth and spacing of cracks caused by stresses building up through cooling in the Martian soil.

He found that polygons caused by thermal contraction could have a maximum diameter of only about 65 meters, much smaller than the troughs he was seeing in the craters.

“I got excited when I saw that the crater floor polygons seemed to be too large to be caused by thermal processes. I also saw that they resembled the desiccation cracks that we see on Earth in dried up lakes,” said El Maarry.

“The stresses that build up when liquids evaporate can cause deep cracks and polygons on the scale I was seeing in the craters,” he added.

El Maarry identified the crater floor polygons using images taken by the MOC camera on Mars Global Surveyor and the HiRISE and Context cameras on Mars Reconnaissance Orbiter.

The polygons in El Maarry’s survey had an average diameter of between 70 and 140 kilometers, with the width of the actual cracks ranging between 1 and 10 meters.

Evidence suggests that between 4.6 and 3.8 billion years ago, Mars was covered in significant amounts of water.

Rain and river water would have collected inside impact crater basins, creating lakes that may have existed for several thousand years before drying out.

However, according to El Maarry, in the northern hemisphere, some of the crater floor polygons could have been formed much more recently.

“When a meteorite impacts with the Martian surface, the heat can melt ice trapped beneath the Martian crust and create what we call a hydrothermal system. Liquid water can fill the crater to form a lake, covered in a thick layer of ice. Even under current climatic conditions, this may take many thousands of years to disappear, finally resulting in the desiccation patterns,” said El Maarry. (ANI)

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Early man used crude version of ‘sat nav’ system to navigate across England

September 15, 2009 By admin Leave a Comment

London, September 15 (ANI): In a new research, a scientist has found that prehistoric man navigated his way across England using a crude version of a satellite navigation system, which was based on stone circle markers.

According to a report in the Telegraph, the research, by historian and writer Tom Brooks, shows that Britain’s Stone Age ancestors were “‘sophisticated engineers” and far from a barbaric race.

Brooks studied all known prehistoric sites as part of his research.

He found that the prehistoric man was able to travel between settlements in England with pinpoint accuracy, thanks to a complex network of hilltop monuments.

These covered much of southern England and Wales and included now famous landmarks such as Stonehenge and The Mount.

New research suggests that they were built on a connecting grid of isosceles triangles that ‘point’ to the next site.

Many are 100 miles or more away, but GPS co-ordinates show all are accurate to within 100 metres.

This provided a simple way for ancient Britons to navigate successfully from point A to B without the need for maps.

“To create these triangles with such accuracy would have required a complex understanding of geometry,” said Brooks.

“The sides of some of the triangles are over 100 miles across on each side and yet the distances are accurate to within 100 metres. You cannot do that by chance,” he added.

“So advanced, sophisticated and accurate is the geometrical surveying now discovered, that we must review fundamentally the perception of our Stone Age forebears as primitive, or conclude that they received some form of external guidance,” he further added.

Brooks analyzed 1,500 sites stretching from Norfolk to north Wales. These included standing stones, hilltop forts, stone circles and hill camps.

Each was built within eyeshot of the next.

Using GPS co-ordinates, he plotted a course between the monuments and noted their positions to each other.

He found that they all lie on a vast geometric grid made up of isosceles ‘triangles’. Each triangle has two sides of the same length and ‘point’ to the next settlement.

Thus, anyone standing on the site of Stonehenge in Wiltshire could have navigated their way to Lanyon Quoit in Cornwall without a map.

According to Brooks, many of the Stone Age sites were created 5,000 years ago by an expanding population recovering from the trauma of the Ice Age.

“The triangle navigation system may have been used for trading routes among the expanding population and also been used by workers to create social paths back to their families while they were working on these new sites,” he said. (ANI)

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Antarctica’s secret water network far more dynamic than believed

September 15, 2009 By admin Leave a Comment

London, September 15 (ANI): The first complete map of the lakes beneath Antarctica’s ice sheets reveals the continent’s secret water network is far more dynamic than we thought, and could be acting as a powerful lubricant beneath glaciers, contributing to sea level rise.

According to a report in New Scientist, Ian Joughin at the University of Washington in Seattle and colleagues developed the map.

Unlike previous lake maps, which are confined to small regions, Joughin and colleagues mapped 124 subglacial lakes across Antarctica using lasers on NASA’s ICESat satellite.

The team also observed the lakes draining and filling.

While interior lakes tended to be static, many coastal lakes changed significantly. Some even appear to be connected by channels under the ice hundreds of kilometres long.

For instance, when upstream lakes under the Recovery glacier drained 3 cubic kilometres of water, lakes downstream gained a similar amount.

Water flowing under glaciers can act as a lubricant, causing land ice to accelerate into the sea and add to rising sea levels.

“The implications for the flow of ice are potentially quite significant,” said Andy Smith of the British Antarctic Survey in Cambridge, UK.

“Those lakes with no clear drainage channels are of particular interest because they could be spreading a thin film of lubricating water under glaciers,” he added. (ANI)

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English cave dig may yield clues as to why Neanderthals became extinct

September 14, 2009 By admin Leave a Comment

London, September 14 (ANI): Archaeologists have discovered teeth and bones from late Ice Age animals, including hyenas, deer and woolly rhinos at a cave in Devon, UK, which may yield clues as to why Neanderthals became extinct.

According to a report by BBC News, the dig, organised by the University of Durham and the University of Sheffield, is part of a study into Neanderthals.

The team at the helm of the privately-funded dig is trying to discover exactly when and why Neanderthals became extinct.

It is also hoping to discover when our own species first came to the UK and if it is connected to the death of Neanderthal Man, as well as finding out more about the nature of later Ice Age life in the cave.

Some items found during the dig are sent away, after cleaning, for radiocarbon dating to accurately check their age.

It is believed that the teeth and bones from the hyena could date back more than 25,000 years. eeth and bones from late Ice Age animals have been found in the cave.

“Our excavation is still in its early days but has already unearthed excellently-preserved fossils and a spearpoint of antler from the Ice Age,” said Dr Paul Pettitt, senior lecturer in archaeology at the University of Sheffield.

“Our research will dramatically improve our understanding of life between 10,000 and 50,000 years ago,” he added.

The dig at Kents Cavern, Torquay, also unearthed a 15,000-year-old spearpoint, known as a “sagaie”, which is made from reindeer antler from the same era.

The spearpoint is thought to be the first complete one found in the UK. (ANI)

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Declining CO2 levels helped in Antarctic formation 34 million years ago

September 14, 2009 By admin Leave a Comment

Washington, September 14 (ANI): In a major research study, the link between declining carbon dioxide (CO2) levels in the earth’s atmosphere and the formation of the Antarctic ice caps some 34 million years ago has been confirmed for the first time.

The research was carried out by a team of scientists from Cardiff, Bristol and Texas A and M universities, in a small East African village, where they extracted microfossils in samples of rocks which show the level of CO2 in the Earth’s atmosphere at the time of the formation of the ice-cap.

Geologists have long speculated that the formation of the Antarctic ice-cap was caused by a gradually diminishing natural greenhouse effect.

The study’s findings confirm that atmospheric CO2 declined during the Eocene – Oligocene climate transition and that the Antarctic ice sheet began to form when CO2 in the atmosphere reached a tipping point of around 760 parts per million (by volume).

According to Professor Paul Pearson from Cardiff University’s School of Earth and Ocean Sciences, who led the mission to the remote East Africa village of Stakishari, “About 34 million years ago, the Earth experienced a mysterious cooling trend. Glaciers and small ice sheets developed in Antarctica, sea levels fell and temperate forests began to displace tropical-type vegetation in many areas.”

“The period, known to geologists as the Eocene – Oligocene transition, culminated in the rapid development of a continental-scale ice sheet on Antarctica, which has been there ever since,” he said.

“We therefore set out to establish whether there was a substantial decline in atmospheric carbon dioxide levels as the Antarctic ice sheet began to grow,” he added.

The team mapped large expanses of bush and wilderness and pieced together the underlying local rock formations using occasional outcrops of rocks and stream beds.

Eventually, they discovered sediments of the right age near a traditional African village called Stakishari.

By assembling a drilling rig and extracting hundreds of meters of samples from under the ground, they were able to obtain exactly the piece of Earth’s history they had been searching for.

According to co-author Dr Gavin Foster from the University of Bristol Earth Sciences Department, “By using the rather unique set of samples from Tanzania and a new analytical technique that I developed, we have, for the first time, been able to reconstruct the concentration of CO2 across the Eocene-Oligocene boundary – the time period about 34 million years ago when ice sheets first started to grow on Eastern Antarctica.” (ANI)

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Climate change is faster in Arctic than in any other location on Earth

September 14, 2009 By admin Leave a Comment

Washington, September 13 (ANI): Researchers at the University of Helsinki in Finland have participated in two new studies, which indicate that climate change is progressing faster in Arctic areas than in any other location on Earth.

The study results indicate that the Arctic eco-system has experienced immense changes in the last twenty years.

At many levels, the changes impact the eco-system services that the environment provides for people: the effects extend to the adequacy of natural resources, food production, climate temperature, and result in changes to the landscape.

The changes in the northern nature can be interpreted as an advance warning of what is to be expected on all latitudes.

The results show that spring begins considerably sooner than before.

The blossoming and pollination period of plants starts as much as twenty days sooner in comparison to the situation ten years ago.

Predators are in dire straits because nutrition is now available too soon in relation to the otherwise favourable nesting period.

The distribution of many insects has moved even more north. European winter moths, for example, have destroyed extensive birch areas in Lapland after moving north.

Species invading new areas might supersede the original species in the area, which is already happening to Arctic foxes, which are currently being overrun by red foxes.

Ivory gulls, ringed seals, polar bears and narwhals are examples of species with a small distribution and specialized habitats, and such species will be the first ones to suffer from the changes.

Climate change also has indirect effects that appear in the interaction between different species.

Olivier Gilg and academy professor Ilkka Hanski from the University of Helsinki have teamed up with Benoit Sittler, a researcher from the University of Freiburg, and studied the waning of the previously cyclical population dynamics of the collared lemming in Greenland.

With mathematical models, the researchers showed that the drastic change in the population dynamics of collared lemmings is explained by the fact that snow melts sooner than before.

The lemmings do not procreate as long as before below the snow, and are also easier for predators to hunt.

In addition, frost-melt events in winter form ice layers in the snow layer or at the tundra’s surface, which is why the lemmings are unable to find food like they used to. (ANI)

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Four giant stone-age axes found in African lake basin

September 14, 2009 By admin Leave a Comment

Washington, September 13 (ANI): A team of archaeologists has found four giant stone hand axes from the dry basin of Lake Makgadikgadi in the Kalahari Desert in Africa, dating back to the Stone Age, which suggests that the region was once much drier and wetter than it is today.

The discovery of the axes is part of the finding of thousands of stone tools on the lake bed, which sheds new light on how humans in Africa adapted to several substantial climate change events during the period that coincided with the last Ice Age in Europe.

Researchers from the School of Geography and the Environment at the University of Oxford are surveying the now-dry basin of Lake Makgadikgadi.

Their research was prompted by the discovery of the first of what are believed to be the world’s largest stone tools on the bed of the lake.

Although the first find was made in the 1990s, the discovery of four giant axes has not been scientifically reported until now.

Four giant stone hand axes, measuring over 30 cm long and of uncertain age, were recovered from the lake basin.

Equally remarkable is that the dry lake floor where they were found is also littered with tens of thousands of other smaller stone-age tools and flakes, according to the researchers.

According to Professor David Thomas, Head of the School of Geography and the Environment at the University of Oxford, “Many of the tools were found on the dry lake floor, not around its edge, which challenges the view that big lakes were only attractive to humans when they were full of water.”

“As water levels in the lake went down, or during times when they fluctuated seasonally, wild animals would have congregated round the resulting watering holes on the lake bed,” he said.

“It’s likely that early human populations would have seen this area as a prolific hunting ground when food resources in the region were more concentrated than at times when the regional climate was wetter and food was more plentiful and the lake was full of water,” he added.

The research team has investigated islands on the floor of the lake – remnants of former sand dunes – which suggest the region’s climate has also been both windier and markedly drier than it is today.

“The interior of southern Africa has usually been seen as being devoid of significant archaeology. Surprisingly, we have found and logged incredibly extensive Middle Stone Age artefacts spread over a vast area of the lake basin,” Professor Thomas said. (ANI)

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Polar bears face extinction in less than 70 years because of global warming

September 12, 2009 By admin Leave a Comment

London, September 11 (ANI): A new research has warned that polar bears face extinction in less than 70 years because of global warming.

“Recent projections suggest polar bears could be extinct within 70 years,” Eric Post, associate professor of biology at Penn State University, who led the latest study, told the Telegraph.

“But we think this could be a very conservative estimate. The outlook is very bleak for them and other creatures such as ringed seals,” he said.

Melting ice is causing Polar bear numbers to drop dramatically, scientists warn.

“The rate at which sea ice is disappearing is accelerating and these creatures rely on it for shelter, hunting and breeding. If this goes, so do they,” said Post.

Others also at risk include ivory gulls, Pacific walruses, ringed and hooded seals and narwhals, small whales with long, spiral tusks.

One of the problems is that other animals are moving north, encroaching on their territory, spurred by increasing temperatures, pushing out native species.

The animals are also struggling with the loss of sea ice.

The international team analyzed average temperature in the Arctic over the last 150 years and warned many animals that are dependent upon the stability and persistence of sea ice are faring especially badly.

Polar bears and ringed seals both give birth in lairs or caves under the snow and can lose many newborn pups when the lairs collapse in unusually early spring rains, triggered by climate change.

Among animals migrating further north are red foxes, which are driving out the smaller Arctic foxes. (ANI)

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Laser cooling may be used to create “exotic” states of matter

September 10, 2009 By admin Leave a Comment

Washington, September 9 (ANI): In a new study, scientists have determined that the technique of laser cooling could be used to create “exotic” states of matter.

According to a report in National Geographic News, in a new technique, Martin Weitz and Ulrich Vogl of the University of Bonn in Germany used a laser to bring the temperature of dense rubidium gas far below the normal point at which the gas becomes a solid.

Previous research had been able to use lasers to quickly “supercool” only very diluted gases.

But, “here’s a case where you shine a laser on something and it actually cools down, and not just a handful of atoms, but a macroscopic object,” said Trey Porto, a physicist with the National Institute of Standards and Technology’s laser-cooling group.

The process could be used to create fascinating new states of matter, according to the study authors.

“For example, if you can very quickly cool water much lower than zero Celsius (32 degrees Fahrenheit), where it would normally turn to ice, exotic crystalline and glassy states of matter would be predicted,” Weitz said.

The new technique could also be used in cooling mechanisms to boost the efficiency of some stargazing equipment, he added.

“If you could cool thermal cameras that look at the stars, they may have less noise and be more sensitive,” he said.

Since a laser’s color is linked to its intensity, the new technique is based on using a red laser in which the frequency has been adjusted so that the beam affects the atoms only when they collide with each other.

Weitz and Vogl shone this laser beam into gaseous rubidium atoms in a high-pressure “atmosphere” of argon.

In the experiment, the rubidium gas fell from 662 degrees Fahrenheit (350 degrees Celsius) to almost 536 degrees Fahrenheit (280 degrees Celsius) within mere seconds.

Much more research needs to be done before the laser-cooling process can be used in real-world applications, study co-author Weitz cautioned.

But, NIST’s Porto said the work already represents a major departure from traditional cooling of diluted gases, which are currently used for studying quantum effects or preparing gas samples for atomic clocks.

“I think the really amazing thing is that you can even get cooling in this regime, because it’s a really dense gas and a very different mechanism,” Porto said.

“Traditional cooling powers are so tiny. To cool a physical object by a measurable degree with a laser is amazing,” he added. (ANI)

Filed Under: Science News Tagged With: ANI, Argon, atmosphere, beam, Bonn, case, celsius, co-author, collide, color, cool water, cooling, degree, departure, efficiency, equipment, example, experiment, Fahrenheit, frequency, Gas, geographic, Germany, glassy, group, handful, ice, institute, intensity, laser, Laser Beam, Laser Cooling Group, Macroscopic Object, Martin Weitz, matter, mechanism, national, National Geographic News, national institute of standards, national institute of standards and technology, New States Of Matter, NEWS, NIST, noise, object, physicist, point, Porto, Pressure Atmosphere, previous research, process, quantum, regime, report, Research, rubidium, Rubidium Atoms, Rubidium Gas, September, shone, something, standards, States Of Matter, study, study authors, Supercool, technique, Technology, temperature, Thermal Cameras, thing, traditional, Trey Porto, Ulrich Vogl, University, university of bonn, Vogl, Washington, water, weitz, work, World Applications

Roads made of solar panels may solve energy crisis

September 10, 2009 By admin Leave a Comment

London, September 9 (ANI): The U.S. Department of Transportation is funding a new research project aimed at replacing asphalt with solar panels as the basic material for making roads, in a bid to solve the crisis of electricity.

As part of the scheme, a U.S. firm called Solar Roadways has won a grant of 100,000 dollars from the Government to carry on with its work on a prototype glass solar cell panel that may one day turn motorways into major energy sources.

It is expected that these panels will be capable of generating enough power to support local communities, according to reports.

The panels would also be covered with a mosaic of small lights, which could be illuminated to provide road markings, and warning messages to drivers.

They could also be embedded with heaters to keep the road clear by melting snow and ice.

The company believes that a four-lane, one-mile stretch of road made from the 12 ft by 12 ft panels, each capable of producing 7.6 kilowatt hours of electricity each day, can generate enough power for 500 homes.

Solar Roadways plans to develop its idea to allow the energy produced to be channelled into the national grid, as well as sold to drivers of electric cars on the roadside.

“This feature packed system will become an intelligent highway that will double as a secure, intelligent, decentralised, self-healing power grid which will enable a gradual weaning from fossil fuels,” the Telegraph quoted the company as saying in a statement. (ANI)

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Jordan furious with Alex Reid for lying about sex film

September 7, 2009 By admin Leave a Comment

London, Sep 7 (ANI): Former model Katie Price, a.k.a. Jordan, reportedly got furious when she came to know about her lover Alex Reid’s involvement in a sex film, which shows him naked in a rape scene.

Before the new nude footage emerged, the 31-year-old had publicly defended her boyfriend from porn allegations by saying that he did not strip for the ultra-violent flick ‘Killer Bitch’.

However, Jordan was left red-faced when Reid showed her a censored version of the film, cutting out his X-rated bits..

According to reports, the film almost cost Reid his love.

“He made a mistake and it nearly cost him his relationship with Kate,” the Daily Star quoted one of Jordan’s friends as saying.

“He’s pulled out of the film and is looking to sue the makers because there has obviously been a very big leak,” the friend added.

Though the two showed a united front at the Burghley Horse Trials, near Stamford, Lincolnshire, the atmosphere between them remained icy as she promoted her KP Equestrian range.

“Despite putting on a brave face, Kate is furious that Alex has betrayed her by lying about the film and keeping secret scenes from her,” a source said.

“She believed everything he said and stood by him, but has been left looking like a total mug. This will leave their relationship in turmoil.

“Kate was all business at Burghley but is set to haul him over the coals for humiliating her once she gets him alone.

“Alex let her make a fool of herself on national TV and it’s touch and go whether she’ll be able to forgive him.

“She’s furious and he’s treading on very thin ice,” the source added. (ANI)

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Europe’s first farmers were migrants who settled about 7,500 years ago

September 4, 2009 By admin Leave a Comment

Washington, September 4 (ANI): The analysis of ancient DNA from skeletons suggests that Europe’s first farmers were not the descendants of Stone Age hunter-gatherers in the region, but were probably migrants who came into major areas of central and eastern Europe about 7,500 years ago, bringing domesticated plants and animals with them.

The research involved the analysis of DNA from hunter-gatherer and early farmer burials, and compared those to each other and to the DNA of modern Europeans.

They conclude that there is little evidence of a direct genetic link between the hunter-gatherers and the early farmers, and 82 percent of the types of mtDNA found in the hunter-gatherers are relatively rare in central Europeans today.

The team from Mainz University in Germany, together with researchers from UCL (University College London) and Cambridge, found that the first farmers in central and northern Europe could not have been the descendents of the hunter-gatherers that came before them.

Humans arrived in Europe 45,000 years ago and replaced the Neandertals. From that period on, European hunter-gatherers experienced lots of climatic changes, including the last Ice Age.

After the end of the Ice Age, some 11,000 years ago, the hunter-gatherer lifestyle survived for a couple of thousand years but was then gradually replaced by agriculture.

The question was whether this change in lifestyle from hunter-gatherer to farmer was brought to Europe by new people, or whether only the idea of farming spread.

The new results from the Mainz-led team seem to solve much of this long-standing debate.

“Our analysis shows that there is no direct continuity between hunter-gatherers and farmers in Central Europe,” said Prof Joachim Burger. “As the hunter-gatherers were there first, the farmers must have immigrated into the area,” he added.

The study identifies the Carpathian Basin as the origin for early Central European farmers.

“It seems that farmers of the Linearbandkeramik culture immigrated from what is modern day Hungary around 7,500 years ago into Central Europe, initially without mixing with local hunter gatherers,” said Barbara Bramanti, first author of the study.

The new study confirms what Joachim Burger’s team showed in 2005; that the first farmers were not the direct ancestors of modern European.

According to Burger, “We are still searching for those remaining components of modern European ancestry. European hunter-gatherers and early farmers alone are not enough. But new ancient DNA data from later periods in European prehistory may shed also light on this in the future.” (ANI)

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Antarctica’s plumbing system more dynamic than previously believed

September 2, 2009 By admin Leave a Comment

Washington, Sept 2 (ANI): Scientists, using space-based lasers on a NASA satellite have created the most comprehensive inventory of lakes that actively drain or fill under Antarctica’s ice, which has revealed a continental plumbing system that is more dynamic than previously thought.

“Even though Antarctica’s ice sheet looks static, the more we watch it, the more we see there is activity going on there all the time,” said Benjamin Smith of the University of Washington in Seattle, who led the study.

Unlike most lakes, Antarctic lakes are under pressure from the ice above. That pressure can push melt water from place to place like water in a squeezed balloon.

The water moves under the ice in a broad, thin layer, but also through a linked cavity system. This flow can resupply other lakes near and far.

Understanding this plumbing is important, as it can lubricate glacier flow and send the ice speeding toward the ocean, where it can melt and contribute to sea level change.

But figuring out what’s happening beneath miles of ice is a challenge.

Researchers led by Smith analyzed 4.5 years of ice elevation data from NASA’s Ice, Cloud and land Elevation satellite (ICESat) to create the most complete inventory to date of changes in the Antarctic plumbing system.

The team has mapped the location of 124 active lakes, estimated how fast they drain or fill, and described the implications for lake and ice-sheet dynamics.

Smith, Helen Fricker, a geophysicist at the Scripps Institution of Oceanography, and colleagues extended their elevation analysis to cover most of the Antarctic continent and 4.5 years of data from ICESat’s Geoscience Laser Altimeter System (GLAS).

By observing how ice sheet elevation changed between the two or three times the satellite flew over a section every year, researchers could determine which lakes were active.

They also used the elevation changes and the properties of water and ice to estimate the volume change.

Only a few of the more than 200 previously identified lakes were confirmed active, implying that lakes in East Antarctica’s high-density “Lakes District” are mostly inactive and do not contribute much to ice sheet changes.

Most of the 124 newly observed active lakes turned up in coastal areas, at the head of large drainage systems, which have the largest potential to contribute to sea level change.

According to Robert Bindschadler, a glaciologist at NASA’s Goddard Space Flight Center, “The survey shows that most active subglacial lakes are located where the ice is moving fast, which implies a relationship.” (ANI)

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Archaeologists to explore how prehistoric Italians made their living at end of the Ice Age

August 25, 2009 By admin Leave a Comment

Washington, August 25 (ANI): Archaeologists at the University of Bradford are all set to lead an exploration into how prehistoric people made their living in Italy at the end of the Ice Age.

According to a report in Bradford Telegraph and Argus, the research aims to find out how hunter-gatherers in Mediterranean Europe survived before farming became widespread and why the transition to agriculture was a smooth one.

Researchers will use high-precision dating to accurately age occupation layers in archaeological cave sites and identify which animals were being hunted by the prehistoric people by studying bones found at sites. he team will also use isotope analyses to identify if the hunted animals migrated seasonally.

“This project brings together cutting edge scientific analyses and traditional archaeological approaches for understanding in the past,” said lead researcher Dr Randolph Donahue.

“It will assist us in explaining how and why people shifted smoothly towards adopting agriculture in Mediterranean Europe following its introduction from the Near East,” he added.

The work will include a study of the production and use of stone tools discarded at the sites to understand how prehistoric people were using the caves.

The results of these combined methods will evaluate which of two theories best explains the food procurement strategies of hunter-gatherers in Mediterranean Europe during the end of the Ice Age.

The first theory suggests prehistoric people followed herds of animals year round in order to hunt them for food while the second theory suggests people moved around the landscape far less by relying far more heavily on small animals, fish and plants.

The project involves more than 20 researchers at ten universities and research centres in the UK, Italy and Germany. (ANI)

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NASA successfully tests eco-friendly rocket propellant

August 22, 2009 By admin Leave a Comment

Washington, August 22 (ANI): NASA and the Air Force Office of Scientific Research, or AFOSR, have successfully launched a small rocket using an environmentally-friendly, safe propellant comprised of aluminum powder and water ice, called ALICE.

“This collaboration has been an opportunity for graduate students to work on an environmentally-friendly propellant that can be used for flight on Earth and used in long distance space missions,” said NASA Chief Engineer Mike Ryschkewitsch at NASA Headquarters in Washington.

“These sorts of university-led experimental projects encourage a new generation of aerospace engineers to think outside of the box and look at new ways for NASA to meet our exploration goals,” he added.

Using ALICE as fuel, a nine-foot rocket soared to a height of 1,300 feet over Purdue University’s Scholer farms in Indiana earlier this month.

ALICE is generating excitement among researchers because this energetic propellant has the potential to replace some liquid or solid propellants.

When it is optimized, it could have a higher performance than conventional propellants.

“By funding this collaborative research with NASA, Purdue University and the Pennsylvania State University, AFOSR continues to promote basic research breakthroughs for the future of the Air Force,” said Dr. Brendan Godfrey, director of AFOSR.

ALICE has the consistency of toothpaste when made. It can be fit into molds and then cooled to -30 degree Celsius 24 hours before flight.

The propellant has a high burn rate and achieved a maximum thrust of 650 pounds during this test.

“A sustained collaborative research effort on the fundamentals of the combustion of nanoscale aluminum and water over the last few years led to the success of this flight,” said Dr. Steven F. Son, a research team member from Purdue.

“ALICE can be improved with the addition of oxidizers and become a potential solid rocket propellant on Earth. Theoretically, ALICE can be manufactured in distant places like the moon or Mars, instead of being transported to distant locations at high cost,” he added. (ANI)

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Big Ben ice sculpture being created in London

August 20, 2009 By admin Leave a Comment

London, August 20 (ANI): Sculptors are creating Big Ben on ice as part of a reconstruction of the London skyline.

The sculpture, measuring 10m in length and 3m in height, is being crafted by some of the world’s top ice sculptors amongst five landmarks.

“This is the first time we have been asked to design and produce a project of this scale,” the Telegraph quoted sculptor Duncan Hamilton as saying.

“The challenge to present such unique large sculptures in five city centres, at the same time and on the same day is wonderful,” he added.

Each scaled-down replica, weighing up to a 3.5 tonnes, is estimated to take four men about five hours to assemble and create.

They are to be unveiled by the Smirnoff Co in Glasgow, Edinburgh, Manchester, Liverpool and London on September 11. (ANI)

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Comets, not asteroids, scarred Moon’s face about 4 billion years ago

July 29, 2009 By admin Leave a Comment

London, July 28 (ANI): A new study of ancient rocks in Greenland has suggested that icy comets – not rocky asteroids – launched a dramatic assault on the Earth and moon around 3.85 billion years ago, thus causing the lunar surface to become scarred.

“We can see craters on the moon’s surface with the naked eye, but nobody actually knew what caused them – was it rocks, was it iron, was it ice?” Uffe Grae Jorgensen, an astronomer at the Niels Bohr Institute in Copenhagen, Denmark, told New Scientist.

“It’s exciting to find signs that it was actually ice,” he said.

Evidence suggests that the Earth and moon had both formed around 4.5 billion years ago.

But, almost all the craters on the moon date to a later period, the “Late Heavy Bombardment” 3.8 to 3.9 billion years ago, when around 100 million billion tonnes of rock or ice crashed onto the lunar surface.

To find out whether asteroids or comets were the main culprits for the bombardment, Jorgensen decided to measure levels of the element iridium in ancient terrestrial rocks.

Iridium is rare on the Earth’s surface because almost all of it bound to iron and sank into the Earth’s core soon after the planet had formed. But iridium is relatively common in comets and meteorites.

His team calculated the amount of iridium that asteroids would leave on the Earth and moon compared to comets.

Because comets have more volatile elements and higher impact speeds due to their more elongated orbits around the sun, they would create giant plumes on impact, allowing more iridium to escape into space than during asteroid impacts.

The team predicted that asteroid bombardment would leave iridium levels of 18,000 and 10,000 parts per trillion in rocks on the Earth and moon respectively, while the same figures for comet bombardment would be about 130 and 10.

Ancient moon rocks returned by NASA’s Apollo missions have already confirmed that the lunar iridium levels are 10 parts per trillion or less.

To find out the terrestrial value, Jorgensen’s team sampled some of the world’s oldest rocks from Greenland, aged 3.8 billion years, and asked a Japanese laboratory to assess their iridium levels more accurately than ever before.

They contained iridium levels of 150 parts per trillion, which strongly suggests comets, rather than asteroids, caused the violent bombardment. (ANI)

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