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Thursday, March 31, 2016

Businessman Rocky De La Fuente took some time to speak with Wikinews about his campaign for the U.S. Democratic Party’s 2016 presidential nomination.

The 61-year-old De La Fuente resides in San Diego, California, grew up in Tijuana, and owns multiple businesses and properties throughout the world. Since getting his start in the automobile industry, De La Fuente has branched out into the banking and real estate markets. Despite not having held or sought political office previously, he has been involved in politics, serving as the first-ever Hispanic superdelegate to the 1992 Democratic National Convention.

De La Fuente entered the 2016 presidential race last October largely due to his dissatisfaction with Republican front-runner Donald Trump. He argues he is a more accomplished businessman than Trump, and attacks Trump as “a clown,” “a joke,” “dangerous,” and “in the same category as Hitler.” Nevertheless, De La Fuente’s business background begets comparisons with Trump. The Alaskan Midnight Sun blog described him as the Democrats’ “own Donald Trump.”

While receiving only minimal media coverage, he has campaigned actively, and according to the latest Federal Election Commission filing, loaned almost US$ 4 million of his own money to the campaign. He has qualified for 48 primary and caucus ballots, but has not yet obtained any delegates to the 2016 Democratic National Convention. Thus far, according to the count at The Green Papers, De La Fuente has received 35,406 votes, or 0.23% of the total votes cast. He leads among the many lesser-known candidates but trails both Senator Bernie Sanders who has received nearly 6.5 million votes and front-runner Hillary Clinton who has just shy of 9 million votes.

With Wikinews reporter William S. Saturn?, De La Fuente discusses his personal background, his positions on political issues, his current campaign for president, and his political future.

Thursday, November 15, 2007

Authorities in Chile say at least two people have been killed and more than 100 injured after a powerful earthquake struck in the north, sending terrified residents into the streets and cutting power to some of the country’s copper mines. According to the United States Geological Survey (USGS), the quake struck on Wednesday, November 14, 2007 at 15:40:53 UTC.

Officials said two women were killed Wednesday when their houses in the town of Tocopilla collapsed during the 7.7 magnitude earthquake. They also said another person may have died in a tunnel collapse there, which has trapped some 50 workers.

Government spokesperson Ricardo Lagos said “They will be evacuated by the Navy via the ocean. As far as we know there are no injured or dead [among the workers].”

The USGS said the quake was centered west of the town of Calama. It was felt as far away as the Chilean capital, Santiago, and neighboring Peru and Bolivia.

Television images showed cars crushed under the concrete awning of a hotel in Antofagasta, 170 kilometers south of the epicenter.

The police chief of Arequipa, Hernan Tamayo said, “People ran out into the streets because of how prolonged the quake was. There was a lot of alarm but no material or human damage.”

The quake was followed by six aftershocks with magnitudes of up to 5.7. Additionally, the quake triggered a tsunami warning which was later lifted.

In Tocopilla, 115 people were injured. Mayor Luis Moyano said about 1,200 houses had been flattened. “Today, the people of Tocopilla are going to have to sleep in the streets,” he said in a radio address.

In total, 3,000 homes have been destroyed in Chile, according to the Housing Minister. The government has airlifted hundreds of portable homes to provide shelter.

In August, an 8.0 magnitude earthquake struck Peru, killing about 540 people and injuring more than 1,000 others. The southern port city of Pisco was one of the areas devastated by the powerful quake, which lasted two minutes.

This article is based on Powerful Earthquake Strikes Northern Chile by VOA News which has a copyright policy compatible with our CC-BY 2.5. Specifically “Copyright status of work by the U.S. government“

Tuesday, June 12, 2007

North America’s largest outdoor dog festival came back to Toronto last weekend for its fifth year. It ran from the 9th of June to the 10th of June at Toronto’s historical St. Lawrence Market. A Wikinews reporter was there on Sunday to report on some of the events that happened on the last day.

The “Woofstock” dog festival attracted as many as 140,000 people with their dogs. The festival had tons of accessories, sold under tents, to buy for dogs; food, toys, designer clothes, and more. About 400 vendors and exhibitors were there to promote their products, which also gave private dog companies or groups a chance to show their new products. The local SPCA and some animal rescues were under tents answering questions from visitors. While walking, all visitors could see the CN Tower and other very tall buildings.

One of the local TV stations, Citytv, was there. They hosted a live event at the show which was broadcast on TV. People came up on the stage and asked questions regarding their dogs and the host and co-host answered them.

A man, who called himself the “Chalk Master”, drew two pictures on pavement with chalk. He did it for free but donations were welcome. One was a picture of a girl’s head beside a dog’s head, and another with a wolf.

“Hello Humans. I’ve been invited here to provide your eyeball(s), with some pretty colours. I don’t get paid as I work this weekend strictly for tips… so, if you like what you see please make a DONATION. If you don’t like it simply reach into the pocket of the person next to you and give me their money. CHALK MASTER.”

A contest called “Canada’s top dog” had its own tent with a professional photographer taking pictures of dogs behind a white screen; the winning photo is to be published on the cover of “Puppy and dog basics” magazine.

Large “Gourmet” dog bones were also served from a cart and table.

Next year’s festival is expected to be bigger and better with even more attractions.

Friday, July 29, 2011

Today sees the reopening of the National Museum of Scotland following a three-year renovation costing £47.4 million (US$ 77.3 million). Edinburgh’s Chambers Street was closed to traffic for the morning, with the 10am reopening by eleven-year-old Bryony Hare, who took her first steps in the museum, and won a competition organised by the local Evening News paper to be a VIP guest at the event. Prior to the opening, Wikinews toured the renovated museum, viewing the new galleries, and some of the 8,000 objects inside.

Dressed in Victorian attire, Scottish broadcaster Grant Stott acted as master of ceremonies over festivities starting shortly after 9am. The packed street cheered an animatronic Tyrannosaurus Rex created by Millenium FX; onlookers were entertained with a twenty-minute performance by the Mugenkyo Taiko Drummers on the steps of the museum; then, following Bryony Hare knocking three times on the original doors to ask that the museum be opened, the ceremony was heralded with a specially composed fanfare – played on a replica of the museum’s 2,000-year-old carnyx Celtic war-horn. During the fanfare, two abseilers unfurled white pennons down either side of the original entrance.

The completion of the opening to the public was marked with Chinese firecrackers, and fireworks, being set off on the museum roof. As the public crowded into the museum, the Mugenkyo Taiko Drummers resumed their performance; a street theatre group mingled with the large crowd, and the animatronic Tyrannosaurus Rex entertained the thinning crowd of onlookers in the centre of the street.

On Wednesday, the museum welcomed the world’s press for an in depth preview of the new visitor experience. Wikinews was represented by Brian McNeil, who is also Wikimedia UK’s interim liaison with Museum Galleries Scotland.

The new pavement-level Entrance Hall saw journalists mingle with curators. The director, Gordon Rintoul, introduced presentations by Gareth Hoskins and Ralph Applebaum, respective heads of the Architects and Building Design Team; and, the designers responsible for the rejuvenation of the museum.

Describing himself as a “local lad”, Hoskins reminisced about his grandfather regularly bringing him to the museum, and pushing all the buttons on the numerous interactive exhibits throughout the museum. Describing the nearly 150-year-old museum as having become “a little tired”, and a place “only visited on a rainy day”, he commented that many international visitors to Edinburgh did not realise that the building was a public space; explaining the focus was to improve access to the museum – hence the opening of street-level access – and, to “transform the complex”, focus on “opening up the building”, and “creating a number of new spaces […] that would improve facilities and really make this an experience for 21st century museum visitors”.

Hoskins explained that a “rabbit warren” of storage spaces were cleared out to provide street-level access to the museum; the floor in this “crypt-like” space being lowered by 1.5 metres to achieve this goal. Then Hoskins handed over to Applebaum, who expressed his delight to be present at the reopening.

Applebaum commented that one of his first encounters with the museum was seeing “struggling young mothers with two kids in strollers making their way up the steps”, expressing his pleasure at this being made a thing of the past. Applebaum explained that the Victorian age saw the opening of museums for public access, with the National Museum’s earlier incarnation being the “College Museum” – a “first window into this museum’s collection”.

The museum itself is physically connected to the University of Edinburgh’s old college via a bridge which allowed students to move between the two buildings.

Applebaum explained that the museum will, now redeveloped, be used as a social space, with gatherings held in the Grand Gallery, “turning the museum into a social convening space mixed with knowledge”. Continuing, he praised the collections, saying they are “cultural assets [… Scotland is] turning those into real cultural capital”, and the museum is, and museums in general are, providing a sense of “social pride”.

McNeil joined the yellow group on a guided tour round the museum with one of the staff. Climbing the stairs at the rear of the Entrance Hall, the foot of the Window on the World exhibit, the group gained a first chance to see the restored Grand Gallery. This space is flooded with light from the glass ceiling three floors above, supported by 40 cast-iron columns. As may disappoint some visitors, the fish ponds have been removed; these were not an original feature, but originally installed in the 1960s – supposedly to humidify the museum; and failing in this regard. But, several curators joked that they attracted attention as “the only thing that moved” in the museum.

The museum’s original architect was Captain Francis Fowke, also responsible for the design of London’s Royal Albert Hall; his design for the then-Industrial Museum apparently inspired by Joseph Paxton’s Crystal Palace.

The group moved from the Grand Gallery into the Discoveries Gallery to the south side of the museum. The old red staircase is gone, and the Millennium Clock stands to the right of a newly-installed escalator, giving easier access to the upper galleries than the original staircases at each end of the Grand Gallery. Two glass elevators have also been installed, flanking the opening into the Discoveries Gallery and, providing disabled access from top-to-bottom of the museum.

The National Museum of Scotland’s origins can be traced back to 1780 when the 11th Earl of Buchan, David Stuart Erskine, formed the Society of Antiquaries of Scotland; the Society being tasked with the collection and preservation of archaeological artefacts for Scotland. In 1858, control of this was passed to the government of the day and the National Museum of Antiquities of Scotland came into being. Items in the collection at that time were housed at various locations around the city.

On Wednesday, October 28, 1861, during a royal visit to Edinburgh by Queen Victoria, Prince-Consort Albert laid the foundation-stone for what was then intended to be the Industrial Museum. Nearly five years later, it was the second son of Victoria and Albert, Prince Alfred, the then-Duke of Edinburgh, who opened the building which was then known as the Scottish Museum of Science and Art. A full-page feature, published in the following Monday’s issue of The Scotsman covered the history leading up to the opening of the museum, those who had championed its establishment, the building of the collection which it was to house, and Edinburgh University’s donation of their Natural History collection to augment the exhibits put on public display.

Closed for a little over three years, today’s reopening of the museum is seen as the “centrepiece” of National Museums Scotland’s fifteen-year plan to dramatically improve accessibility and better present their collections. Sir Andrew Grossard, chair of the Board of Trustees, said: “The reopening of the National Museum of Scotland, on time and within budget is a tremendous achievement […] Our collections tell great stories about the world, how Scots saw that world, and the disproportionate impact they had upon it. The intellectual and collecting impact of the Scottish diaspora has been profound. It is an inspiring story which has captured the imagination of our many supporters who have helped us achieve our aspirations and to whom we are profoundly grateful.“

The extensive work, carried out with a view to expand publicly accessible space and display more of the museums collections, carried a £47.4 million pricetag. This was jointly funded with £16 million from the Scottish Government, and £17.8 million from the Heritage Lottery Fund. Further funds towards the work came from private sources and totalled £13.6 million. Subsequent development, as part of the longer-term £70 million “Masterplan”, is expected to be completed by 2020 and see an additional eleven galleries opened.

The funding by the Scottish Government can be seen as a ‘canny‘ investment; a report commissioned by National Museums Scotland, and produced by consultancy firm Biggar Economics, suggest the work carried out could be worth £58.1 million per year, compared with an estimated value to the economy of £48.8 prior to the 2008 closure. Visitor figures are expected to rise by over 20%; use of function facilities are predicted to increase, alongside other increases in local hospitality-sector spending.

Proudly commenting on the Scottish Government’s involvement Fiona Hyslop, Cabinet Secretary for Culture and External Affairs, described the reopening as, “one of the nation’s cultural highlights of 2011” and says the rejuvenated museum is, “[a] must-see attraction for local and international visitors alike“. Continuing to extol the museum’s virtues, Hyslop states that it “promotes the best of Scotland and our contributions to the world.“

So-far, the work carried out is estimated to have increased the public space within the museum complex by 50%. Street-level storage rooms, never before seen by the public, have been transformed into new exhibit space, and pavement-level access to the buildings provided which include a new set of visitor facilities. Architectural firm Gareth Hoskins have retained the original Grand Gallery – now the first floor of the museum – described as a “birdcage” structure and originally inspired by The Crystal Palace built in Hyde Park, London for the 1851 Great Exhibition.

The centrepiece in the Grand Gallery is the “Window on the World” exhibit, which stands around 20 metres tall and is currently one of the largest installations in any UK museum. This showcases numerous items from the museum’s collections, rising through four storeys in the centre of the museum. Alexander Hayward, the museums Keeper of Science and Technology, challenged attending journalists to imagine installing “teapots at thirty feet”.

The redeveloped museum includes the opening of sixteen brand new galleries. Housed within, are over 8,000 objects, only 20% of which have been previously seen.

The Window on the World rises through the four floors of the museum and contains over 800 objects. This includes a gyrocopter from the 1930s, the world’s largest scrimshaw – made from the jaws of a sperm whale which the University of Edinburgh requested for their collection, a number of Buddha figures, spearheads, antique tools, an old gramophone and record, a selection of old local signage, and a girder from the doomed Tay Bridge.

The arrangement of galleries around the Grand Gallery’s “birdcage” structure is organised into themes across multiple floors. The World Cultures Galleries allow visitors to explore the culture of the entire planet; Living Lands explains the ways in which our natural environment influences the way we live our lives, and the beliefs that grow out of the places we live – from the Arctic cold of North America to Australia’s deserts.

The adjacent Patterns of Life gallery shows objects ranging from the everyday, to the unusual from all over the world. The functions different objects serve at different periods in peoples’ lives are explored, and complement the contents of the Living Lands gallery.

Performance & Lives houses musical instruments from around the world, alongside masks and costumes; both rooted in long-established traditions and rituals, this displayed alongside contemporary items showing the interpretation of tradition by contemporary artists and instrument-creators.

The museum proudly bills the Facing the Sea gallery as the only one in the UK which is specifically based on the cultures of the South Pacific. It explores the rich diversity of the communities in the region, how the sea shapes the islanders’ lives – describing how their lives are shaped as much by the sea as the land.

Both the Facing the Sea and Performance & Lives galleries are on the second floor, next to the new exhibition shop and foyer which leads to one of the new exhibition galleries, expected to house the visiting Amazing Mummies exhibit in February, coming from Leiden in the Netherlands.

The Inspired by Nature, Artistic Legacies, and Traditions in Sculpture galleries take up most of the east side of the upper floor of the museum. The latter of these shows the sculptors from diverse cultures have, through history, explored the possibilities in expressing oneself using metal, wood, or stone. The Inspired by Nature gallery shows how many artists, including contemporary ones, draw their influence from the world around us – often commenting on our own human impact on that natural world.

Contrastingly, the Artistic Legacies gallery compares more traditional art and the work of modern artists. The displayed exhibits attempt to show how people, in creating specific art objects, attempt to illustrate the human spirit, the cultures they are familiar with, and the imaginative input of the objects’ creators.

The easternmost side of the museum, adjacent to Edinburgh University’s Old College, will bring back memories for many regular visitors to the museum; but, with an extensive array of new items. The museum’s dedicated taxidermy staff have produced a wide variety of fresh examples from the natural world.

At ground level, the Animal World and Wildlife Panorama’s most imposing exhibit is probably the lifesize reproduction of a Tyrannosaurus Rex skeleton. This rubs shoulders with other examples from around the world, including one of a pair of elephants. The on-display elephant could not be removed whilst renovation work was underway, and lurked in a corner of the gallery as work went on around it.

Above, in the Animal Senses gallery, are examples of how we experience the world through our senses, and contrasting examples of wildly differing senses, or extremes of such, present in the natural world. This gallery also has giant screens, suspended in the free space, which show footage ranging from the most tranquil and peaceful life in the sea to the tooth-and-claw bloody savagery of nature.

The Survival gallery gives visitors a look into the ever-ongoing nature of evolution; the causes of some species dying out while others thrive, and the ability of any species to adapt as a method of avoiding extinction.

Earth in Space puts our place in the universe in perspective. Housing Europe’s oldest surviving Astrolabe, dating from the eleventh century, this gallery gives an opportunity to see the technology invented to allow us to look into the big questions about what lies beyond Earth, and probe the origins of the universe and life.

In contrast, the Restless Earth gallery shows examples of the rocks and minerals formed through geological processes here on earth. The continual processes of the planet are explored alongside their impact on human life. An impressive collection of geological specimens are complemented with educational multimedia presentations.

Beyond working on new galleries, and the main redevelopment, the transformation team have revamped galleries that will be familiar to regular past visitors to the museum.

Formerly known as the Ivy Wu Gallery of East Asian Art, the Looking East gallery showcases National Museums Scotland’s extensive collection of Korean, Chinese, and Japanese material. The gallery’s creation was originally sponsored by Sir Gordon Wu, and named after his wife Ivy. It contains items from the last dynasty, the Manchu, and examples of traditional ceramic work. Japan is represented through artefacts from ordinary people’s lives, expositions on the role of the Samurai, and early trade with the West. Korean objects also show the country’s ceramic work, clothing, and traditional accessories used, and worn, by the indigenous people.

The Ancient Egypt gallery has always been a favourite of visitors to the museum. A great many of the exhibits in this space were returned to Scotland from late 19th century excavations; and, are arranged to take visitors through the rituals, and objects associated with, life, death, and the afterlife, as viewed from an Egyptian perspective.

The Art and Industry and European Styles galleries, respectively, show how designs are arrived at and turned into manufactured objects, and the evolution of European style – financed and sponsored by a wide range of artists and patrons. A large number of the objects on display, often purchased or commissioned, by Scots, are now on display for the first time ever.

Shaping our World encourages visitors to take a fresh look at technological objects developed over the last 200 years, many of which are so integrated into our lives that they are taken for granted. Radio, transportation, and modern medicines are covered, with a retrospective on the people who developed many of the items we rely on daily.

What was known as the Museum of Scotland, a modern addition to the classical Victorian-era museum, is now known as the Scottish Galleries following the renovation of the main building.

This dedicated newer wing to the now-integrated National Museum of Scotland covers the history of Scotland from a time before there were people living in the country. The geological timescale is covered in the Beginnings gallery, showing continents arranging themselves into what people today see as familiar outlines on modern-day maps.

Just next door, the history of the earliest occupants of Scotland are on display; hunters and gatherers from around 4,000 B.C give way to farmers in the Early People exhibits.

The Kingdom of the Scots follows Scotland becoming a recognisable nation, and a kingdom ruled over by the Stewart dynasty. Moving closer to modern-times, the Scotland Transformed gallery looks at the country’s history post-union in 1707.

Industry and Empire showcases Scotland’s significant place in the world as a source of heavy engineering work in the form of rail engineering and shipbuilding – key components in the building of the British Empire. Naturally, whisky was another globally-recognised export introduced to the world during empire-building.

Lastly, Scotland: A Changing Nation collects less-tangible items, including personal accounts, from the country’s journey through the 20th century; the social history of Scots, and progress towards being a multicultural nation, is explored through heavy use of multimedia exhibits.

Sunday, November 28, 2004

A more efficient way to produce useable hydrogen has been demonstrated by researchers. It uses very high-temperature electrolysis to separate hydrogen from water, so that hydrogen may be used for energy production.

Electrolysis is one method by which laboratories and factories produce hydrogen. An electrical current is passed through water, breaking it down into hydrogen and oxygen gas, which are then collected above the water reservoir.

Researchers in Salt Lake City, Utah, at Ceramtech Incorporated, in collaboration with workers at The Idaho National Engineering and Environmental Laboratory report that when water is superheated to 800 degrees Celsius, far less electricity is required to produce the same volume of hydrogen. The researchers envision that future nuclear fission plants could be used both to heat the water as part of their cooling system, and generate the needed electricity.

Concerns have been raised regarding the safety of such arrangements, however. Jeremy Desterhoft, an independent consultant on nuclear energy safety, warns the “elevated levels of radiation required to sufficiently lower the atomic separation point is beyond the current capabilities of any recent cooler.” He does not believe that economically viable cooling technology will be available for at least four to six more years.

Friday, January 8, 2010

With violence against foreigners escalating daily, and after being deluged with various threats and demands from al-Shabaab, a radical Islamic militant group with ties to al-Qaeda, the United Nations World Food Programme announced on Tuesday that, as of the end of this week, they are going to suspend all of their operations within southern Somalia—including the distribution of desperately needed food aid to Somali civilians. This is now the third humanitarian agency, after CARE International and Doctors Without Borders, to evacuate from the war-torn nation.

The pull out, which will include the closing down of all UN offices and the withdrawal of all local staff, is going to effect over one million Somalis—many of whom relay on this food program for their daily meals.

When asked by the New York Times to further explain the UN’s decision, Peter Smerdon, a spokesperson for the program, said via telephone from Nairobi, Kenya, “In the past few weeks there has been a harder line of unacceptable demands and conditions set by armed groups (such as al-Shabaab) in these areas. We sadly had to make the decision to pull our staff out.”

Smerdon also cited the fact that over forty aid workers have been killed between January 2008 and September 2009, and that four volunteers still remain in the hands of their captors.

Furthermore, when asked how this move by the UN will effect the Somali people, Smerdon said simply, “People will go hungry…you could see malnutrition rates rising [as a result].” When asked by a British newspaper, The Morning Star, the same question, another program representative, Emilia Casella, conveyed like sentiments, “[Those] dependent on food assistance in southern Somalia face a situation that is particularly dire.”

In a nation that—due to civil war—has not had a functioning government in over two decades, Islamic extremists groups—such as al-Shabaab—as well as various warlords and pirate gangs control most of the Horn of Africa nation, except for its besieged capital, Mogadishu, which is protected by African Union and NATO troops in addition to UN peacekeepers.

According to the UN, al-Shabaab—which has direct influence over the area that is going to be effected—presented their offices with numerous lists of demands. Among their demands was that the UN pay Shabaab a $20,000 protection fee every six months, seek Shabaab approval for all their projects, fire their entire female staff, and run their operations according to the militant group’s schedule.

When asked by The Associated Press about the UN’s decision to leave southern Somalia—including his own town of Jilib—Somali civilian and father of eight children, Abdullahi Awnur, said that al-Shabaab is responsible for driving the UN food program away, and that what they are doing is “indirect[ly] killing” innocent people.

Awnur went on to say, “We have been forced to flee from our houses and depend on [UN] food aid, and now that it is finished, that means [al-Shabaab] here does not want us to live.”

Despite all that has been said, al-Shabaab spokesperson, Sheik Ali Mohamud Rage, told New York Times reporters that he found these claims to be “baseless” in their origins. He continued by stating that, “All we (al-Shabaab) ordered them (the UN) was to buy food from Somali farmers and distribute it. They (the UN) do not want to do that, and because of that, they have made this very ridiculous justification.” Nevertheless, the UN has noted that even when harvests were good, Somali farmers are only able to supply 30-40% of the food needed to sustain the bulk of the country’s population.

“[Somalia] has been described as the most complex emergency in the world, and perhaps the most dangerous to operate in. However, the world is not hearing this,” say David Gilmour director of CARE International’s Somali branch.

Saturday, August 16, 2014

A team of researchers from the University of Tennessee, Knoxville, has confirmed that near-Earth asteroid (29075) 1950 DA is primarily held together by van der Waals forces rather than gravity. They have shown that the rotation rate of the 1.1 km asteroid is higher than could be possible if only gravity and friction were responsible for holding it together. Cohesive forces prevent large scale shedding of material and breakup of the asteroid. Their study was published Wednesday in Nature.

The researchers found that the bulk density 1.7±0.7 g/cm³ of the asteroid is approximately two times lower than the value required for self-gravity to balance out the centrifugal forces caused by rotation. As Ben Rozitis, a planetary scientist and a co-author of the study, told Space.com: “I was expecting to find a high-density metallic asteroid, as such an asteroid wouldn’t require cohesive forces to hold itself together under its fast rotation. Instead we found the opposite! […] We knew from previous work that this asteroid was rotating faster than it should be, and we wanted to know why”.

Spectral observations of 1950DA indicated that it is either an E- or M-type asteroid in the Tholen classification. However, its low optical albedo and low radar circular polarization ratio (a very smooth surface at centimetre to decimetre scales) showed that it cannot be an E-type asteroid.

Unusually for an M-type asteroid (which are mostly metallic), 1950DA has low radar albedo. It would have been puzzling, if it was not for the Rosetta observations of 21 Lutetia, which is also an M-type asteroid with very similar low radar albedo. Researchers have used for 1950DA the same meteorite analogue which was earlier found to fit best 21 Lutetia: enstatite chondrite with grain density of 3.55 g/cm³. It allowed to calculate macro-porosity of 51±19%, indicating that 1950DA is a rubble-pile asteroid.

Taking into account thermal-infrared measurements of thermal inertia, presence of a fine-grained regolith is implied, primarily around 1950DA’s equator. Negative ambient gravity near the equator of the asteroid (48±24% of its surface) requires existence of cohesive forces to prevent loss of material. This is similar to an effect noticed between the fine grains of regolith on the Moon. Lunar regolith was found to be highly cohesive because of van der Waals forces between grains by the Apollo 17 expedition in 1974.

As Ben Rozitis explained: “We found a low-density rubble pile that traditionally would be unable to hold itself together unless cohesive forces were present. It’s exciting because we’ve provided the first evidence that cohesive forces are important for small asteroids, which had only been predicted up until now.”

The balance between cohesion and negative gravity requires small grain sizes consistent with the grain size distribution on 1950DA, and similar to that of another rubble-pile asteroid, (25143) Itokawa. Unlike Itokawa, 1950DA does not have large boulders on the surface; they may have been lost as 1950DA’s rotation accelerated due to YORP effect. This effect results in a change of the rotation rate of an asteroid (either faster or slower), and is caused when the Sun heats up an object unevenly, due to asymmetric surface topography. As the heat escapes, the rotation rate is slowly changed due to an uneven rate of cooling. The researchers find that a rubble-pile asteroid may have a high rotation rate, if it is held together by cohesive forces between the grains. But as the spin rate increases due to YORP effect, the centrifugal force may cause the rubble pile to eventually separate as it happened with P/2013 R3.

The findings may have implications for asteroid impact avoidance. A very small impulse may break one potentially hazardous object into several pieces. As Ben Rozitis said: “You’d want to avoid interacting with the asteroid directly. An alternative is to use a ‘gravity tractor,’ or a heavy spacecraft placed near the asteroid, which uses the force of gravity to pull the asteroid off course”. Bong Wie, an aerospace engineer at Iowa State University in Ames, noted: “I just hope that an asteroid on a collision course with Earth will not be spinning rapidly and it will not be a rubble-pile asteroid”.

According to Daniel Scheeres, an aerospace engineer at the University of Colorado, Boulder, understanding such cohesive forces may also be important for future asteroid mining. Ben Rozitis clarified: “Mining missions intend to visit small asteroids about 10 meters (33 feet) or less in size, as it is thought that they are predominantly solid bodies. However, cohesive forces enable such small asteroids to be rubble piles instead. A small rubble-pile asteroid would be harder to interact with and collect, as it can easily deform or break up when subject to external forces.”

The study was supported by Jet Propulsion Laboratory, California Institute of Technology and the NASA.

Thursday, May 4, 2006

Rescuers are continuing their efforts to reach the trapped miners in the Beaconsfield mine in northern Tasmania.

A five tonne borer drilling machine has been secured in place to drill a one metre hole through the remaining 12-16 metres of rock that fell into the main shaft.

Since drilling began at 7pm last night, the machine has made a 2 cm wide pilot hole half way to the miners.

The trapped miners have been given egg sandwiches and yogurt, and have received apple ipod MP3 players filled with the miners favourite songs to pass the time and drown out the sounds of the drilling.

Meanwhile on the surface, the ever-growing media frenzy in Beaconsfield has forced the mine operators to enforce bag checks of rescuers entering the mine to ensure that no recording devices are taken into the mine.