David beckham's wife Victoria posts picture and Twitters that a UFO hovered over her Los Angeles home

David beckham's wife Victoria posts picture and Twitters that a UFO hovered over her Los Angeles home ....

Federal authorities to shut off all TV and radio communications simultaneously 11/9/11 at 2PM ET

If you have ever wondered about the government’s ability to control the civilian airwaves, you will have your answer on November 9th.

The Coming Derivatives Crisis That Could Destroy The Entire Global Financial System

Most people have no idea that Wall Street has become a gigantic financial casino.

5 to 6 Thousand Dead Birds wash ashore at Wasaga Beach, Canada

Thousands of dead birds have flooded the shores of Georgian Bay in a scene that locals compared to the devastation from an oil spill.

UFO over Sioux Falls? Experts think it was a meteor

Amie Neustrom doesn't have a good explanation for what she saw in the night sky near her Renner home early Wednesday.

RT AMERICA

Showing posts with label NATURE. Show all posts
Showing posts with label NATURE. Show all posts

Thursday, November 17, 2011

Restless underwater volcano disrupts life on Canary Island

© Guardia Civil
Madrid - Steaming magma is bubbling onto the sea surface. The earth shakes, and a smell of sulphur floats in the air.

For over a month, residents of the Spanish Canary Island of El Hierro have lived with an active underwater volcano that not only poses a security threat, but also scares off tourists and endangers the inhabitants' livelihoods.

Volcanic eruptions could continue for weeks, civil protection science representative Carmen Lopez said this week.

However, the situation has been deemed safe enough for the 550 evacuated residents of the fishing village of La Restinga to return home, though the island was still being hit by earthquakes.

The earth began trembling on El Hierro on July 19, in a sign that magma was rising toward the surface of the smallest Canary Island.

Evacuation

The island of 11 000 residents has a large volcano and more than 250 craters. But its volcanic power had been dormant for centuries, with the last eruption reported in 1793.

El Hierro has now experienced more than 11 000 earthquakes since July. The vast majority were not noticed by the population, but grew in intensity.

Dozens of people were evacuated for fear of rockslides in September, and an army unit was put on standby to help in the event of a mass evacuation.

An underwater eruption occurred on October 10, following an earthquake of a magnitude greater than 4. Scientists observing seismic activity confirmed the eruption. Dead fish were seen floating on the water.

Volcanic activity has since continued intermittently, with witnesses reporting jets of gas and ash spewing several metres above sea level.

The eruptions have sent a large volume of greenish magma spilling into the sea.

An oceanographic vessel discovered a 100m-high volcano with a 120m-diameter crater located at a depth of about 200m.

Eruptions

It is thought possible that magma is also breaking through one or two other outlets. Some of the eruptions have been observed as close as 1.5km off El Hierro's southern coast.

The nearby La Restinga has been evacuated several times. There has also been concern over a possible eruption off Frontera, the island's economic capital in the north, following strong earthquakes in the area. More than 50 people were evacuated.

"The worst scenario would be an eruption on land," Canaries security chief Juan Manuel Santana told the daily El Pais.

There is even a remote possibility of eruptions resulting in new land. Possible names for a new Canary Island have already been suggested on the internet, such as Atlantis or Discovery.

For the moment, however, experts are most concerned about the presence of toxic gases, though there is practically no evidence so far of health damage to the population.

Most El Hierro residents are more worried about their livelihoods than about the simmering volcano.

Emergency

The earthquakes and eruptions have brought fishing and touristic diving to a standstill in La Restinga, some of whose residents had to resort to emergency food aid.

Life is now returning to the village while two nearby coves still remain closed to the public.

The authorities are also maintaining some of the traffic restrictions imposed earlier. Traffic will remain limited in a key tunnel linking Frontera with the island's capital Valverde. The traffic problems have sparked more protests over economic losses.

There were initial hopes that the volcano would draw more tourists to the island, which receives about 7 000 visitors annually.

But the opposite happened, with more than 1 500 cancelling their holidays and causing losses worth hundreds of thousands of euros for the local tourism industry, its representatives said.

Magma now covers some of the island's rich underwater flora and fauna at the Mar de las Calmas marine reserve, which was a favourite among tourists.

Some El Hierro residents are preparing demonstrations, accusing Prime Minister Jose Luis Rodriguez Zapatero's government of abandoning them.

"Other emergencies only last a certain time, but that is not the case now," Santana said. "What people want is a return to normality, to routine."

Remarkable Solar Activity

There haven't been any strong solar flares in days. Nevertheless, some impressive activity is underway on the sun. For one thing, an enormous wall of plasma is towering over the sun's southeastern horizon. Stephen Ramsden of Atlanta, Georgia, took this picture on Nov. 11th:

Gigantic Prominence on Sun
© Stephen W. Ramsden
Image taken: Nov. 12, 2011
Location: Atlanta, GA
"Solar forums all over the world are buzzing with Sun-astronomers proclaiming this to be the biggest prominence that many of them had ever witnessed," he says.

Remarkably, though, this is not the biggest thing. A dark filament of magnetism is snaking more than halfway around the entire sun: SDO image. From end to end, it stretches more than a million km or about three times the distance between Earth and the Moon. If the filament becomes unstable, as solar filaments are prone to do, it could collapse and hit the stellar surface below, triggering a Hyder flare. No one can say if the eruption of such a sprawling structure would be Earth directed.

"I cant help but wonder what could possibly come next since we are still over a year away from the forecasted Solar Maximum," adds Ramsden. "There's never been a better time to own a solar telescope than now!"

More Images:
From Alan Friedman of Buffalo, NY; from Theo Ramakers of Social Circle, GA; from John Stetson of Falmouth, Maine; from Randy Shivak of Elyria, OH; from Steve Riegel of Albuquerque, NM; from Robert Arnold of Ilse of Skye, Scotland

Snap! Erupting Filament

For the past few days, astronomers around the world have been monitoring a dark filament of magnetism sprawled more than 1,000,000 kilometers across the face of the sun. Make that 750,000 km. On Nov. 14th the filament snapped and flung a fraction of itself into space. NASA's Solar Dynamics Observatory recorded the action:

Magnetic Filament
© SpaceWeather
Click here to watch a 3Mb movie.

The eruption hurled a cloud of plasma into space, but not toward Earth. The only effect on our planet would be to disappoint observers hoping for a longer filament.

Meanwhile, a wall of plasma towering over the sun's SE limb is seething with activity and may be poised to erupt as well. Readers with solar telescopes are encouraged to monitor developments.

More Images:
From Sylvain Weiller of Saint Rémy lès Chevreuse, France; from John Stetson of Falmouth, Maine; from Chris Hetlage of Deerlick Astronomy Village, Georgia; from David Cortner of Rutherford College, North Carolina; from Jo Dahlmans of Ulestraten The Netherlands; from Francisco A. Rodriguez of the Canary Islands; from Ron Cottrell of Oro Valley, Arizona; from Gianfranco Meregalli of Milano Italy; from Roel Weijenberg of Wilp, Gelderland, Netherlands; from Andy Burns of Chippenham, Wiltshire, UK.

NASA Finds Great Lake of Water on Jupiter's Moon Europa (Video)

NASA

Data from a NASA planetary mission have provided scientists evidence of what appears to be a body of liquid water, equal in volume to the North American Great Lakes, beneath the icy surface of Jupiter's moon, Europa.

The water could represent a potential habitat for life, and many more such lakes might exist throughout the shallow regions of Europa's shell, lead author Britney Schmidt, a postdoctoral fellow at The University of Texas at Austin's Institute for Geophysics, writes in the journal Nature.

Monday, November 14, 2011

Rescue for the remaining Two surviving Sperm Whales continues in Tasmania whale tragedy after 22 Died - 14th Nov 2011

Rescue for the remaining Two surviving Sperm Whales continues in Tasmania whale tragedy after 22 Died - 14th Nov 2011



22 Sperm Whales Die in Australia

22 Sperm Whales Die in Australia

© Tasmania Parks And Wildlife
Steve Mansfield (L) and James Grey from the Parks and Wildlife Service tag deceased sperm whales on Ocean Beach near Strahan on Tasmania's west coast on November 1. Wildlife staff are battling wet and windy conditions as they try to save four sperm whales stranded in shallow water after 22 others die.
Rescuers were racing against the clock Monday to save two huge sperm whales stranded on a Tasmanian sandbank after 22 others died, the Parks and Wildlife Service said.

Marine mammal specialists were on site in Macquarie Harbour at Strahan on Tasmania's northwest coast, but the rescue bid was hampered by rough weather.

Twenty-two of the whales -- each weighing two tonnes and up to 12 metres (40 feet) long -- washed ashore on Saturday at Ocean Beach near Strahan, and all of them died.

Four others came into the harbour and became stranded on a sandbank. Two of these were successfully refloated and swam back out to sea, but the other two remain stuck.

Rescuers said two minke whales also got into trouble nearby and died.

Tasmanian Parks and Wildlife incident controller Chris Arthur said the sperm whales were so big that they could not simply be pulled into deeper water by volunteers, instead requiring a more complicated rescue operation.

"A specially-developed net attached to two boats has been designed to slip under a whale, enabling it to be hauled from immediate danger," he said.

"This method can be used for large animals and is very effective."

But conditions were worsening, with high winds and seas, and attempts to refloat the whales had to be postponed until Tuesday.

"Although we were unable to move the surviving whales into open water today, we are hoping conditions will improve over the next few days," Arthur said, adding that the whales were tired but still flapping their fins and blowing water.

"The weather conditions are against us at present, but managed properly, these animals can survive at least a few days."

Another problem in Strahan is its treacherous narrow channel, known as Hells Gates, through which the whales must pass to get back into deeper water.

"Pushing a large whale against sea surging through the 25-metre passage is like pushing a cork into a bottle," added Arthur.

But he expressed confidence given that seven sperm whales were saved after a similar stranding in the harbour in 2007.

The Parks and Wildlife Service said that samples had been taken from the 22 dead whales, which will remain on the beach until they decompose because they are too large to move or bury.

Explaining why they died, Arthur said: "People seem to forget that these animals breathe air. When they are caught in the surf and they are being rolled around, they are in the sand -- they can't get their blowholes up to get oxygen."

Whale beachings are relatively common in Australia and they usually occur in the summer months, particularly around Tasmania, but scientists do not know why they happen.

Thursday, November 10, 2011

The best spot in the world to SURF. VIDEO: Surfer Garrett McNamara rides record-breaking 90 foot wave off Portugal

VIDEO: Surfer Garrett McNamara rides record-breaking 90 foot wave off Portugal


surfer garrett macnamara
We had no idea Portugal's coast got such big waves, but would you beleive it, it does. 90 foot ones, waves bigger than your house, your neighbour's bigger house, and things that are 89 feet -- that big. It's all thanks to the massive underwater gorge called "Nazaré Canyon" that creates unusual giant waves.



Hawaii-born Garrett McNamara describes himself as a "Extreme Waterman Explorer & Big Wave Champion" on his website, but by us, he's the luckiest surfer alive, happening upon the record-breaking wave whilst out tow-in surfing with Andrew Cotton and Al Mennie during the surfing gathering known as the "ON North Canyon Project 2011".



"I feel so blessed and honoured to have been invited to explore this canyon and its special town. The waves here are such a mystery", Garrett said afterwards. Um, okay Garrett, right you are. Still, nice job!








And for another angle, here's a Portguese news report on the big wave...








Wednesday, November 9, 2011

Surprise, surprise! Global warming is over, says expert

global warming myth
© cartoonaday.com

It's one of the hottest feuds in science - climate chance zealots insist that we're still destroying the planet but now another scientist has warned the cast-iron evidence just isn't there.

For a minute there it seemed the global warming debate had finally been resolved.

While for years scientists and sceptics have raged against each other on the crucial topic, new research hailed "the most definitive study into temperature data gathered by weather stations over the past half-century" seemed to come to an authoritative conclusion.

Global warming IS real it said, strengthening the need for us all to reduce carbon emissions and boost efforts to try to save the planet.

And this research was headed by a physicist who had previously been a sceptic of global warming and an outspoken critic of the science underpinning it, lending the results even greater credibility.

Prof Richard Muller had spent two years trying to discover if the mainstream scientists were wrong but concluded they were right. Temperatures are rising and his results, he concluded, "proved you should not be a sceptic, at least not any longer". Case closed.

But is it? Not according to Prof Judith Curry, a member of Prof Muller's team, who claims the same findings have shown that global warming has stopped - plunging the rest of us into a quandary of what and who to believe.

When Prof Curry heard that Prof Muller was saying that the Berkeley Earth Surface Temperature (BEST) findings would put an end to climate change scepticism for good she was horrified. "This isn't the end of scepticism," she exclaimed.

"To say that is the biggest mistake he has made. When I saw he was saying that I just thought, 'Oh my God.'"

Prof Muller, of Berkeley University in California, and Prof Curry, who chairs the Department Of Earth And Atmospheric Sciences at America's Georgia Institute of Technology, were part of the BEST project that carried
out analysis of more than 1.6 billion temperature recordings collected from more than 39,000 weather stations around the world.

Prof Muller appeared on Radio 4's Today Programme last Friday where he described how BEST's findings showed that since the Fifties global temperatures had risen by about 1 degree Celsius, a figure which is in line with estimates from Nasa and the Met Office.

When asked whether the rate had stopped over the last 10 years he said they had not. "We see no evidence of it having slowed down," he replied and a graph issued by the BEST project suggests a continuing and steep increase.

But this last point is one which Prof Curry has furiously rebuttted. In a serious clash of scientific experts Prof Curry has accused Prof Muller of trying to "hide the decline in rates of global warming".

She says that BEST's research actually shows that there has been no increase in world temperatures for 13 years.

She has called Prof Muller's comments "a huge mistake" and has said that she now plans to discuss her future on the project with him. "There is no scientific basis for saying that global warming hasn't stopped," she says.

"To say that there is detracts from the credibility of the data, which is very unfortunate." New research also seems to back up Prof Curry rather than Prof Muller.

A report published by the Global Warming Foundation, which is based on BEST's findings, includes a graph of world average temperatures over the past 10 years and it is absolutely flat, suggesting that temperatures have remained constant.

This issue is crucial because the levels of carbon dioxide in the air have continued to rise rapidly over the last decade and if temperatures have remained constant during that period it would suggest there is no direct link between carbon gas emissions and global warming.

Previously carbon dioxide emissions - from the burning of fossil fuels and from deforestation - have been considered one of the biggest causes of climate change, the most damaging effects of which are thought to be the melting of the polar ice caps and the rise in sea levels as well as an increase in extreme weather events such as floods and droughts.

"Whatever it is that is going on here it doesn't look like it's being dominated by carbon dioxide," says Prof Curry.

Prof Muller has made it clear that the BEST study was not conducted in order to gauge the causes of global warming, saying the study "made no assessment on how much of this is due to humans and how much is natural".

He and his scientists - who also included this year's physics Nobel winner Saul Perlmutter - set out purely to determine once and for all whether climate change had occurred.

The group had been suspicious of previous results which confirmed a rise in global temperatures , believing that their work may have been skewed by the "urban heat island effect" where increasing urbanisation around weather stations was causing the temperature increases recorded over the past 50 years.

But their exhaustive research discovered that the urban heat effect could not explain the global temperature increase of about one degree Celsius since 1950.

It is well to point out that Prof Curry is not disputing the one degree Celsius increase. She is disputing Prof Muller's suggestion that temperatures haven't levelled off in the last decade.

Indeed she says this global warming standstill since the end of the Nineties - which has been completely unexpected - has wide-reaching consequences for the causes of climate change and has already led many climate scientists to start looking at alternative factors that may have contributed to global warming, other than carbon gas emissions. In particular she has mentioned the influence of clouds, natural temperature cycles and solar radiation.

What she also seems furious about is the way that Prof Muller went about publishing BEST's results without consulting her and before a proper peer review could be carried out. "It is not how I would have played it," she has said. "I was informed only when I got a group email. I think they have made errors and I distance myself from what they did. It would have been smart to consult me."

This is, you can be sure, not the last we will hear on the debate.

Monday, November 7, 2011

Mobile Permaculture Design Lab at Occupy Wall Street

Permaculture @ Occupy Wall Street
A small clip, with some information about permaculture :D



Largest Sunspot in Years Observed on the Sun

Sunspot AR1339
© SDO
The gigantic sunspot in the upper left of this image is about 50,000 miles (80,000 km) long and was observed on the sun by NASA's Solar Dynamics Observatory on Nov. 3, 2011.

One of the largest sunspots in years has appeared on the sun, darkening part of its glowing face.

The massive sunspot, called AR1339, is about 50,000 miles (80,000 km) long, and 25,000 miles (40,000 km) wide, reports SpaceWeather.com. For comparison, Earth itself is only 8,000 miles (12,800 km) wide.

The sunspot behemoth isn't yet facing our planet, but was spotted today (Nov. 3) by NASA's Solar Dynamics Observatory (SDO) satellite. The spacecraft's photos of the giant sunspot show the solar region as it comes into view on the northeastern edge, or limb, of the sun.

When it does turn our way in the days ahead, it should be an "easy target for backyard solar telescopes," according to SpaceWeather.com.

The sunspot is actually a group of nearby darkened spots on the sun, some of which are individually wider than planet Earth.

Sunspots appear when intense magnetic activity ramps up on the sun, blocking the flow of heat through the process of convection, which causes areas of the sun's surface to cool down. These isolated areas then appear dimmer than the surrounding area, creating a dark spot.

The intense magnetic activity around sunspots can often cause solar flares, which are large releases of energy that can actually brighten up the sun. Flares are also accompanied by flows of charged particles out into space, called coronal mass ejections, which can wreak havoc on satellites and power grids on Earth if they head our way.

SpaceWeather.com warns that a huge sunspot like AR1339 comes with a large potential for solar flares. The National Oceanic and Atmospheric Administration (NOAA) forecasts a 50 percent chance of medium-class M solar flares over the next 24 hours due to this sunspot.

In fact, the spot has already produced one class M4 solar flare on Nov. 2 that was observed by SDO. A large coronal mass ejection from this flare was observed, but it was not directed toward Earth. However, as the sunspot turns toward our planet in the coming days, we may be in for a greater chance of these ejections.

Latest Update:

Earth-orbiting satellites have just detected an X2-class solar flare. The source is huge sunspot AR1339, described above. Stay tuned for more updates.

3 New Heavy Elements Named: Darmstadtium, Roentgenium, Copernicium


Nicolaus Copernicus


The periodic table of elements just got a bit heftier today (Nov. 4), as the names of three new elements were approved by the General Assembly of the International Union of Pure and Applied Physics.

Elements 110, 111 and 112 have been named darmstadtium (Ds), roentgenium (Rg) and copernicium (Cn).

These elements are so large and unstable they can be made only in the lab, and they fall apart into other elements very quickly. Not much is known about these elements, since they aren't stable enough to do experiments on and are not found in nature. They are called "Super Heavy," or Transuranium, elements.

The General Assembly approved these name suggestions proposed by the Joint Working Party on the Discovery of Elements, which is a joint body of IUPAP and the International Union of Pure and Applied Chemistry (IUPAC).

World revolves around Copernicium

Temporarily called ununbium, copernicium, the new element 112, was named for Russian astronomer Nicolaus Copernicus (1473-1543), who first suggested that the Earth revolves around the sun, not the other way around, and starting the "Copernican Revolution." In a statement released in July 2009, Sigurd Hofmann, head of the discovery team at GSI Helmholtz Centre for Heavy Ion Research in Germany, said they named the element after Copernicus "to honor an outstanding scientist, who changed our view of the world."

Hofmann and his colleagues first created a single atom of this extremely radioactive element on Feb. 9, 1996, by smashing together zinc and lead. Since then, a total of about 75 atoms of copernicium have been created and detected. It wasn't until 10 years after the discovery and multiple repeat experiments that the working group recognized element 112.

Roentgenium, after a modern physicist

Element number 111, officially renamed roentgenium by the General Assembly, was originally discovered in 1994 when a team at GSI created three atoms of the element, about a month after their discovery of darmstadtium, on Dec. 8. The working party needed a repeat performance to officially name the element, so the team repeated its experiment in 2002 and made three more atoms.

Roentgenium was named after German physicist Wilhelm Conrad Roentgen (1845 - 1923), ridding itself of its temporary name unununium, Roentgen was the first to produce and detect X-rays, on Nov. 8 1895. He won the Nobel Prize in physics in 1901 for the work.

Darmstadtium mighty number 110

Darmstadtium, the new element 110, which took the temporary name ununnilium, was first synthesized on Nov. 9, 1994, at the GSI facility near the city of Darmstadt. It was discovered by Peter Armbruster and Gottfried Münzenberg, under Hofmann's direction. It was created by crashing a heavy isotope of lead with nickel-62, which created four atoms of darmstadtium. The experiment was repeated with nickel-64, creating nine more atoms.

Robert Kirby-Harris, chief executive at the Institute of Physics and secretary-general of IUPAP, said, "The naming of these elements has been agreed in consultation with physicists around the world and we're delighted to see them now being introduced to the Periodic Table."

Hubble Directly Observes the Disc Around a Black Hole


@Spacetelescope

A team of scientists has used the NASA/ESA Hubble Space Telescope to observe a quasar accretion disc - a brightly glowing disc of matter that is slowly being sucked into its galaxy's central black hole. Their study makes use of a novel technique that uses gravitational lensing to give an immense boost to the power of the telescope. The incredible precision of the method has allowed astronomers to directly measure the disc's size and plot the temperature across different parts of the disc.

An international team of astronomers has used a new technique to study the bright disc of matter surrounding a faraway black hole. Using the NASA/ESA Hubble Space Telescope, combined with the gravitational lensing effect of stars in a distant galaxy [1], the team measured the disc's size and studied the colours (and hence the temperatures) of different parts of the disc. These observations show a level of precision equivalent to spotting individual grains of sand on the surface of the Moon.

While black holes themselves are invisible, the forces they unleash cause some of the brightest phenomena in the Universe. Quasars - short for quasi-stellar objects - are glowing discs of matter that orbit supermassive black holes, heating up and emitting extremely bright radiation as they do so.
"A quasar accretion disc has a typical size of a few light-days, or around 100 billion kilometres across, but they lie billions of light-years away. This means their apparent size when viewed from Earth is so small that we will probably never have a telescope powerful enough to see their structure directly," explains Jose Muñoz, the lead scientist in this study.
Until now, the minute apparent size of quasars has meant that most of our knowledge of their inner structure has been based on theoretical extrapolations, rather than direct observations.

The team therefore used an innovative method to study the quasar: using the stars in an intervening galaxy as a scanning microscope to probe features in the quasar's disc that would otherwise be far too small to see. As these stars move across the light from the quasar, gravitational effects amplify the light from different parts of the quasar, giving detailed colour information for a line that crosses through the accretion disc.

The team observed a group of distant quasars that are gravitationally lensed by the chance alignment of other galaxies in the foreground, producing several images of the quasar.

They spotted subtle differences in colour between the images, and changes in colour over the time the observations were carried out. Part of these colour differences are caused by the properties of dust in the intervening galaxies: the light coming from each one of the lensed images has followed a different path through the galaxy, so that the various colours encapsulate information about the material within the galaxy. Measuring the way and extent to which the dust within the galaxies blocks light (known to astronomers as the extinction law) at such distances is itself an important result in the study.

For one of the quasars they studied, though, there were clear signs that stars in the intervening galaxy were passing through the path of the light from the quasar [2]. Just as the gravitational effect due to the whole intervening galaxy can bend and amplify the quasar's light, so can that of the stars within the intervening galaxy subtly bend and amplify the light from different parts of the accretion disc as they pass through the path of the quasar's light.

profile across the accretion disc. This is important because the temperature of an accretion disc increases the closer it is to the black hole, and the colours emitted by the hot matter get bluer the hotter they are. This allowed the team to measure the diameter of the disc of hot matter, and plot how hot it is at different distances from the centre.

They found that the disc is between four and eleven light-days across (approximately 100 to 300 billion kilometres). While this measurement shows large uncertainties, it is still a remarkably accurate measurement for a small object at such a great distance, and the method holds great potential for increased accuracy in the future.
"This result is very relevant because it implies we are now able to obtain observational data on the structure of these systems, rather than relying on theory alone," says Muñoz. "Quasars' physical properties are not yet well understood. This new ability to obtain observational measurements is therefore opening a new window to help understand the nature of these objects."

Notes

The Hubble Space Telescope is a project of international cooperation between ESA and NASA.

The study, entitled "A study of gravitational lens chromaticity with the Hubble Space Telescope", will appear in the December 1 issue of the Astrophysical Journal. The international team of astronomers consists of: J. A. Muñoz (University of Valencia, Spain), E. Mediavilla (Instituto de Astrofísica de Canarias, Spain), C. S. Kochanek (Ohio State University, USA), E. E. Falco (Harvard-Smithsonian Center for Astrophysics, USA) and A. M. Mosquera (University of Valencia and Ohio State University).

[1] Gravity bends the structure of spacetime, and hence deflects beams of light. When the alignment is right, with one object directly behind another, the foreground object's gravity 'bends' the light like a lens, a process called gravitational lensing. Gravitational lenses typically produce multiple, distorted images of the distant object.

The most dramatic effects from gravitational lensing are the amplification and distortion of light from distant galaxies as it passes through massive galaxy clusters.

This effect also takes place on smaller scales, with galaxies at an intermediate distance lensing the light of distant quasars, producing multiple images of them that are visible through the lens galaxy.

Individual stars can also lens light, although this effect, called gravitational microlensing, is much more subtle and can only be detected by measuring how the lensing effect increases the source's brightness.

This study makes use of gravitational microlensing by stars in a foreground galaxy to study the accretion disc of a quasar in the background. It also uses the interplay of quasar light and gravitational lensing to probe the gas and dust content of intermediate galaxies.

[2] The lens galaxy in which this phenomenon was observed is called [WKK93] G; the lensed quasar is called HE 1104-1805.

Image credit: NASA, ESA, J.A. Muñoz (University of Valencia)

Sunday, November 6, 2011

Kenya army warns of al-Shabab donkeys in Somalia

Kenya army warns of al-Shabab donkeys in Somalia

Kenyan troops near Somali border
Kenya's military has denied reports that it bombed a refugee camp last week

Kenya's military spokesman has said large groups of donkeys in Somalia will be considered "al-Shabab activity" following reports the militants are using the animals to transport weapons.

Maj Emmanuel Chirchir used Twitter to warn Kenyans not to sell their donkeys to the Islamist group.

Kenya sent troops into Somalia to establish a buffer zone, after accusing al-Shabab of cross-border kidnappings.

Al-Shabab, which controls southern Somalia, denies the allegations.

It has accused Kenya of planning a full-scale invasion of Somalia.

On Tuesday, Maj Chirchir used official Twitter account to warn that al-Shabab camps near 10 Somali towns would soon be attacked and urged residents to leave.

However, no such attacks have yet occurred.

He has also posted video which he says shows a small al-Shabab boat being sunk, killing 18 militants and warned aircraft not to land in the Islamist-held town of Baidoa, following reports that al-Shabab had been flying in new supplies of weapons.

In his latest series of tweets, the Kenyan military spokesman said that the price of donkeys had risen from $150 (£100) to $200 following the increased al-Shabab demand for the animals.

"Any large concentration and movement of loaded donkeys will be considered as al-Shabab activity," he wrote, suggesting they would be targeted by Kenyan firepower.

"Selling Donkeys to al-Shabab will undermine our efforts in Somalia," he continued.

BBC East Africa correspondent Will Ross says it is not clear whether al-Shabab are using donkeys because the muddy roads are impassable for vehicles or to avoid detection from aircraft.

Maj Chirchir also said that any "unauthorised flying over the region" would be considered a threat.

"All aircrafts are hereby warned not to land in BAIDOA. Anyone violating this will be doing so at their peril," he wrote.

map

Last weekend, the Kenyan military was accused of bombing a refugee camp, killing five people, including three children.

Maj Chirchir denied the accusation and said a Kenyan fighter jet had only hit al-Shabab positions in Jilib, killing 10 militia fighters.

People abducted from Kenya since September include a French woman suffering from cancer, who French authorities say has since died; a British woman taken from a coastal resort, whose husband was killed in the raid; and a Kenyan driver and two Spanish aid workers seized from the Dadaab refugee camp near the Kenya-Somalia border.

After two decades of civil conflict, Somalia is awash with guns, and analysts say any number of groups could have carried out the kidnappings - including pirate gangs.

Al-Shabab, which is linked to al-Qaeda, is locked in a battle with the weak UN-backed interim government for control of the parts of the country which are currently outside its power, particularly the capital, Mogadishu.

Mysterious 'Unicorns of the Sea' Tracked by Scientists for First Time

Mysterious 'Unicorns of the Sea' Tracked by Scientists for First Time

The frigid waters of the Arctic are home to near-mythical creatures, sometimes called the "unicorns of the sea" for the long, ivory tusk that spirals several feet out of the top of their heads.

Worldwide there are only about 50,000 to 80,000 narwhals, as they are more commonly known, with about two-thirds of these whales summering in the fjords and inlets of Nunavut in northern Canada.

Scientists are hoping to learn more about narwhals through a new effort to track them as they move around the icy waters of northern Canada, as well as more about how declining amounts of sea ice are affecting the creatures.

"Although we've been working on a better understanding of the narwhal in the past seven or eight years, it was only recently that people have figured out how to fit satellite radios to them, so we know where they go and what they're eating,” said Pete Ewins, an Arctic species specialist for the environmental group WWF-Canada.

Narwhal transmitters

A new project tagged nine narwhals in Tremblay Sound off the coast of the northern province of Nunavut back in August. The scientists restrained the whales, which can weigh up to 3,500 pounds (1,600 kilograms), and fitted them with a satellite radio that has a transmitter mounted with Teflon rods to the blubber near the whale's dorsal area.

"The whole system is no bigger than a Blackberry cellphone, with a little transmitter the length of a pencil that sticks up," Ewins told OurAmazingPlanet.

When a narwhal comes to surface, the radio unit contacts with the air and activates the signal transmission. The animal's location is then sent via satellite to the researchers.

Of those nine whales fitted with the device, seven still have trackers that are transmitting information. For the others, the system likely malfunctioned or fell off. Eventually all of the trackers will be slowly expelled by the animals’ immune system.

While seven whales isn't a huge sample size, Ewins said that a lot of information can be gained by watching where the whales go. "Their position tells you depth of water over which they're spending the dark days of winter," he said.

Preserving Arctic waters

In addition to the basic coordinates, digital sensors also record the depth and the duration of each whale's dive. From that information, scientists can infer what the whales are eating during different times of the year, and how the thickness of sea ice in different parts of the Arctic impacts their behavior. [Infographic: Tallest Mountain to Deepest Ocean Trench]

The information can also be used to make a case for keeping these northern waters free from oil and gas exploration. Since narwhals are both protected and acoustically sensitive, knowing their locations could help the government make better decisions to preserve marine environments.

"The local native Inuit, who are our partners, are concerned about the changes in the sea ice but also the prospect of noisy ships and explosions to test for oil and gas," Ewins said.


Read more: http://www.foxnews.com/scitech/2011/11/01/mysterious-unicorns-if-sea-tracked-by-scientists-for-first-time/#ixzz1cxF8OoFr

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