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Thursday, June 23, 2011

NASA’s Cassini–Huygens spacecraft has discovered evidence for a large-scale saltwater reservoir beneath the icy crust of Saturn’s moon Enceladus. The data came from the spacecraft’s direct analysis of salt-rich ice grains close to the jets ejected from the moon. The study has been published in this week’s edition of the journal Nature.

Data from Cassini’s cosmic dust analyzer show the grains expelled from fissures, known as tiger stripes, are relatively small and usually low in salt far away from the moon. Closer to the moon’s surface, Cassini found that relatively large grains rich with sodium and potassium dominate the plumes. The salt-rich particles have an “ocean-like” composition and indicate that most, if not all, of the expelled ice and water vapor comes from the evaporation of liquid salt-water. When water freezes, the salt is squeezed out, leaving pure water ice behind.

Cassini’s ultraviolet imaging spectrograph also recently obtained complementary results that support the presence of a subsurface ocean. A team of Cassini researchers led by Candice Hansen of the Planetary Science Institute in Tucson, Arizona, measured gas shooting out of distinct jets originating in the moon’s south polar region at five to eight times the speed of sound, several times faster than previously measured. These observations of distinct jets, from a 2010 flyby, are consistent with results showing a difference in composition of ice grains close to the moon’s surface and those that made it out to the E ring, the outermost ring that gets its material primarily from Enceladean jets. If the plumes emanated from ice, they should have very little salt in them.

“There currently is no plausible way to produce a steady outflow of salt-rich grains from solid ice across all the tiger stripes other than salt water under Enceladus’s icy surface,” said Frank Postberg, a Cassini team scientist at the University of Heidelberg in Germany.

The data suggests a layer of water between the moon’s rocky core and its icy mantle, possibly as deep as about 50 miles (80 kilometers) beneath the surface. As this water washes against the rocks, it dissolves salt compounds and rises through fractures in the overlying ice to form reserves nearer the surface. If the outermost layer cracks open, the decrease in pressure from these reserves to space causes a plume to shoot out. Roughly 400 pounds (200 kilograms) of water vapor is lost every second in the plumes, with smaller amounts being lost as ice grains. The team calculates the water reserves must have large evaporating surfaces, or they would freeze easily and stop the plumes.

“We imagine that between the ice and the ice core there is an ocean of depth and this is somehow connected to the surface reservoir,” added Postberg.

The Cassini mission discovered Enceladus’ water-vapor and ice jets in 2005. In 2009, scientists working with the cosmic dust analyzer examined some sodium salts found in ice grains of Saturn’s E ring but the link to subsurface salt water was not definitive. The new paper analyzes three Enceladus flybys in 2008 and 2009 with the same instrument, focusing on the composition of freshly ejected plume grains. In 2008, Cassini discovered a high “density of volatile gases, water vapor, carbon dioxide and carbon monoxide, as well as organic materials, some 20 times denser than expected” in geysers erupting from the moon. The icy particles hit the detector target at speeds between 15,000 and 39,000 MPH (23,000 and 63,000 KPH), vaporizing instantly. Electrical fields inside the cosmic dust analyzer separated the various constituents of the impact cloud.

“Enceladus has got warmth, water and organic chemicals, some of the essential building blocks needed for life,” said Dennis Matson in 2008, Cassini project scientist at NASA’s Jet Propulsion Laboratory in Pasadena, California.

“This finding is a crucial new piece of evidence showing that environmental conditions favorable to the emergence of life can be sustained on icy bodies orbiting gas giant planets,” said Nicolas Altobelli, the European Space Agency’s project scientist for Cassini.

“If there is water in such an unexpected place, it leaves possibility for the rest of the universe,” said Postberg.

Tuesday, December 25, 2007

A Basler BT-67, chartered from Canadian air carrier Kenn Borek Air for the National Science Foundation (NSF), a United States government agency, has crashed whilst attempting take-off during a support assignment in Antarctica. None of the ten people on board were injured, but the modified Douglas DC-3 was substantially damaged in the accident.

The accident occurred on the morning of December 20 local time, about 550 miles from McMurdo Station, a US-run Antarctic base. The aircraft was carrying a crew of four, and six researchers. The flight was part of the Polar Earth Observatory Network project, which is part-funded by the NSF. The project sets up GPS equipment and seismic sensors in various locations across Antarctica, in order to monitor changes in the ice sheets that cover the continent. It is thought that this will aid understanding of global warming.

Although the NSF refused to publicise any details of the crash, one anonymous passenger has come forward about the accident, releasing his account in the form of an online report. According to the passenger, one side of the plane failed to lift off, and the aircraft’s wing subsequently dug into the ice.

“My seat came unbolted from the floor with me still strapped into the seatbelt,” the passenger said. “When we finally came to a halt, we were all in big pile in the corner of the plane with all of the equipment. We got shaken up pretty bad, but there were no major injuries other than some minor cuts and bruises… The wings, props, and tail all got bent up pretty bad. The landing gear, skis, and hydraulic system all were ripped from the plane and strewn about the ice.”

Following the accident, all those on board spent about twenty hours before they were flown back to McMurdo Station on board two Twin Otter aircraft sent from the base on a rescue mission. A full investigation has been launched into the crash by the Department of the Interior‘s Aircraft Management Division (AMD), who have signed a memorandum of agreement with NSF to conduct any necessary investigations on their behalf. The AMD have subsequently contacted the United States National Transportation Safety Board, who will participate in conjunction with the Transportation Safety Board of Canada.

Saturday, July 26, 2008

On July 7 and again on July 23, there were accidental leaks at the Tricastin Nuclear Power Center in France, which is a collection of sites in four different communes: Saint-Paul-Trois-Châteaux and Pierrelatte in Drôme, and Bollène and Lapalud in Vaucluse.

Along with two other minor incidents on July 18, it has prompted the Commission for Independent Research and Information on Radioactivity (Criirad) to order a review of security and safety. Already last week, Environment Minister Jean-Louis Borloo said the ground water near all reactors should be tested and the state of waste storage sites assessed.

In the latest incident, a hundred workers were exposed to radiation. They all work for Électricité de France (EDF), which runs the Tricastin facilities with Areva. This marks the largest number of workers to be collectively contaminated in French nuclear history.

The leak was at reactor number four, which was shut for refuelling. Workers were exposed to Cobalt 58 dust which escaped while maintenance work was being carried out. Sensors noticed a rise in the level of radiation and the workers were then evacuated.

“Seventy of them show low traces of radioelements, below one fortieth of the authorized limit,” EDF said. A spokesperson later raised the number to 97 people. Criirad warned, however, that the limit was “not the level from which risk begins but the maximum acceptable level.”

“We have an alarm system which is meant to protect the staff from contamination via the atmosphere,” said Tricastin director Alain Peckre. “If a problem is detected, the alarms go off, our security procedures swing into place and everyone is evacuated from the building.”

A union representative from Confédération générale du travail (CGT) alleged that EDF was reducing maintenance and increasingly using sub-contractors, putting workers at risk in exchange for profitability.

“We spend 1.5 billion euros a year on ensuring our plants are in optimum condition,” countered an EDF spokesperson. “Safety is our top priority over and above providing electricity to the network. Since our power stations were set up, 80 per cent of maintenance operations on reactors that have been temporarily turned off are carried out by external contractors. They are the most competent to maintain and repair specific parts of the reactor, some of which they have taken part in building.”

The previous incident, on July 8, involved a 74kg spill of liquid containing unenriched uranium. Thirty cubic metres of water overflowed while a tank was being emptied. Subsequent test showed that contamination may have occurred for years.

Local wine growers Coteaux du Tricastin AOC have already become concerned about the negative association with “Tricastin” and have begun considering changing the name of their Appellation d’origine contrôlée (AOC).

“It’s only a question of image as nuclear and food don’t mix very well in consumers’ minds,” said the AOC’s president, Henri Bour, to The Daily Telegraph. Nuclear authorities “didn’t understand our move, doubtless not wanting to admit that the nuclear industry’s image is perhaps not perfect,” he added.

“Nuclear was progress and we wanted that. We thought people were competent. Now we ask, were there previous incidents we weren’t told about?” said local resident Roger Eymard to The Guardian.

Autorité de sûreté nucléaire (ASN), a nuclear safety authority, has already criticised Areva for its handling of the first incident. ASN complained of poor communication with authorities and unsatisfactory security measures and operational procedures.

The leaks have occurred just as President Nicolas Sarkozy has been promoting the European Pressurized Reactor (EPR) as a solution to rising energy costs and global warming.

France has the second largest nuclear power network in the world and generates over 80% of its electricity through nuclear power.

Wednesday, March 25, 2009

A New Jersey state senator has filed a lawsuit seeking to overturn a federal law banning sports betting in 46 states.

State Sen. Raymond Lesniak, a Democrat representing portions of Union County, filed the suit Monday, arguing the 17-year-old law is unconstitutional because it treats four states differently than the other states.

Under the law, sports betting is prohibited in all states except Delaware, Oregon, Montana and Nevada, although only the latter two currently allow wagering.

“This federal law deprives the State of New Jersey of over $100 million of yearly revenues, as well as depriving our casinos, racetracks and Internet operators of over $500 million in gross income,” Lesniak said in a statement to the press.

The 39-page lawsuit is believed to be the first challenge to the Professional and Amateur Sports Protection Act of 1992. New Jersey missed a 1994 deadline that would have allowed it to join the other states when the law was implemented.

Atlantic City officials and their political allies have argued allowing sports betting would give all the states a new source of revenue needed in the face of a staggering recession.

New Jersey Governor Jon Corzine was not involved with the lawsuit, but he said legalizing sports betting would help Atlantic City and said it was “worth pursuing”.

Legalizing sports betting in New Jersey could bring the state more than $50 million in annual tax revenue, according to officials from the Interactive Media Entertainment & Gaming Inc., a Washington, D.C.-based consultant for the electronic gaming industry, which joined Lesniak as a plaintiff in the lawsuit.

“This is about more than revenue,” said Joe Brennan Jr., chairman of Interactive Media Entertainment. “It’s about jobs and economic activity.”According to 1999 study, $380 billion in illegal sports betting occurs in the state each year.

New Jersey, in particular, is facing a difficult budget season, and the Atlantic City casinos are in what the Associated Press called a “financial meltdown”. Eleven of the city’s casinos suffered their biggest revenue decline in 30 years last month.

Delaware is reported to be considering regulating sports betting, which New Jersey backers of the lawsuit said adds a sense of urgency to the issue.

“We cannot afford to be naive about illegal sports betting,” New Jersey State Sen. Jeff Van Drew said in a statement to the press. “It’s happening right now, and is funding other criminal enterprises which are far more dangerous.”

The New Jersey Thoroughbred Horsemen’s Association, the Thoroughbred Breeders Association of New Jersey and the Standardbred Breeders & Owners Association of New Jersey were also listed as plaintiffs in the lawsuit.

Wednesday, January 9, 2008

This year Israel turns sixty and it has embarked upon a campaign to celebrate its birthday. Along with technology writers for Slate, PC Magazine, USA Today, BusinessWeek, Aviation Weekly, Wikinews was invited by the America-Israel Friendship League and the Israeli Foreign Ministry to review Israel’s technology sector. It’s part of an effort to ‘re-brand the country’ to show America that there is more to Israel than the Palestinian conflict. On this trip we saw the people who gave us the Pentium processor and Instant Messaging. The schedule was hectic: 12-14 hours a day were spent doing everything from trips to the Weizmann Institute to dinner with Yossi Vardi.

On Thursday, the fifth day of the junket, David Saranga of the foreign ministry was able to arrange an exclusive interview for David Shankbone with the President of Israel, Nobel Peace Prize recipient Shimon Peres. For over an hour they spoke about Iranian politics, whether Israel is in danger of being side-lined in Middle Eastern importance because of Arab oil wealth, and his thoughts against those who say Israeli culture is in a state of decay.

Shimon Peres spent his early days on kibbutz, a bygone socialist era of Israel. In 1953, at the age of 29, Peres became the youngest ever Director General of the Ministry of Defense. Forty years later it was Peres who secretly gave the green light for dialogue with Yassir Arafat, of the verboten Palestine Liberation Organization. It was still official Israeli policy to not speak with the PLO. Peres shares a Nobel Peace Prize with Yitzak Rabin and Arafat for orchestrating what eventually became the Oslo Accords. The “roadmap” that came out of Oslo remains the official Israeli (and American) policy for peace in the Palestinian conflict. Although the majority of Israeli people supported the plans, land for peace was met with a small but fiery resistance in Israel. For negotiating with Arafat, former Prime Minister Benjamin Netanyahu shouted at Peres, “You are worse than Chamberlain!” a reference to Hitler’s British appeaser. It was during this time of heated exchanges in the 1990s that Yitzhak Rabin was assassinated by Yigal Amir, a Jew who thought it against Halakhic law to give up land given by God (Hashem).

Peres is the elder statesman of Israeli politics, but he remembers that he has not always been as popular as he is today. “Popularity is like perfume: nice to smell, dangerous to drink,” said Peres. “You don’t drink it.” The search for popularity, he goes on to say, will kill a person who has an idea against the status quo.

Below is David Shankbone’s interview with Shimon Peres, the President of Israel.

Friday, January 20, 2006

Today, Arsenal have confirmed that they will be adding Theo Walcott to their side, after a 12.5 million pound deal was struck, on the premise that he pass rigorous medical examinations. Although the 16-year-old striker cannot sign until he turns 17 on 16 March, Wenger seems to see this only as a formality, as the player is set to be unveiled today at Highbury.

Although there are not many other details at this moment, it is thought that he will not be able to return to Southampton on loan, due to the hectic schedule that he will have at Arsenal. Whatever way the deal may turn out, it seems that Theo’s family are with him whatever he does.

Wednesday, October 15, 2008

The UK Government has stated that children in Britain will no longer be required to take compulsory, externally marked tests at the age of fourteen.

The change takes effect immediately, meaning that children who were due to take the test this year no longer have to do so.

Secretary of State for Children, Schools and Families Ed Balls yesterday announced his plans to radically change the UK testing system, in parliament.

Currently, almost ten million tests are sat each year by British pupils. This change is expected to cut the number of tests taken in half, according to The Guardian.

The tests for seven and eleven year olds are not being abolished. A review group is being set up, however, to research the effect of these tests on eleven-year-olds.

Instead of league tables showing test results, the government will produce report cards for secondary schools. According to Ed Balls, the results from GCSEs will be adequate to judge the performance of schools by their test results.

The decision to abolish the tests for fourteen year olds came as a result of a situation earlier this year, when there were long delays with the delivery of test results to students of this age.

According to Christine Blower, acting general secretary of the National Union of Teachers, the government is admitting that the previous test system failed by making this move.

“For too long English, mathematics and science teachers in secondary schools have found themselves skewing everything to enable their pupils to jump through a series of unnecessary hoops,” she claimed, while Chris Keates, general secretary of the National Association of Schoolmasters Union of Women Teachers, said that “the sound of a deep collective sigh of relief will emanate from secondary schools across the country.”

Both major UK opposition parties welcomed this move. Conservative Shadow Secretary of State for Children Michael Gove stated that his party have “argued for fewer national tests and more rigor and we want to work constructively to improve the assessment and qualifications regime.”

David Laws, Shadow Secretary of State for Children for the Liberal Democrats, said that “the Sats tests taken by 14-year-olds are not only a waste of time but have been highly unreliable over the last few years.”