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.

Wednesday, July 25, 2012

Homebush Bay, New South Wales —Wikinews sat down with Great Britain men’s national wheelchair basketball player Joni Pollock before a practice session at the Rollers & Gliders World Challenge in Sydney.

British-born Pollock was born with the condition spina bifida. He explained he could walk with difficulty up until age twelve or thirteen, after which he began using a wheelchair. Shortly after this, he began playing wheelchair basketball. He attended a disabilities tournament for children with disabilities in England, where he tried both wheelchair basketball, since he came from a town where team sports were popular; and wheelchair tennis, as he’d played with an able-bodied friend. Ultimately, he chose wheelchair basketball as it was a team sport.

Wikinews asked Pollock about being loud towards his team mates during the match on July 20 between the Australian Rollers and the Great Britain Bulldogs. He said he was out of wheelchair basketball for nine months due to a pressure sore and surgery on his shoulder, and has been making a comeback since January, with the doctors and physiotherapists giving him the all-clear in April. On that night, he said, the Australian team used bullying tactics and some of his teammates on the British team didn’t step up to win the game. He also said that no matter what team his team plays against, he has a target on his back because of his calibre of playing in the game, and his team failed to to understand it that night, leaving him frustrated with his team and himself; and, he hates coming to Australia during a Paralympic year since the home town —that is, Australian— referees do not protect the visiting team from the home team’s dirty playing, which puts the British team’s gold medal prospects in jeopardy.

Wikinews also asked Pollock his opinions regarding Oscar Pistorius. Pollock believes Pistorius shouldn’t be competing in the Olympics if other Paralympic athletes can’t compete. He also mentioned reservations about certain technical aspects, such as whether Pistorius would be the same height if he still had his legs rather then his prosthetic legs. Asked about 5 point players playing in wheelchair basketball, he said he believes 5 point players can play with other point players but not in the Paralympics, and said 5 point players currently play in the domestic league but not at the elite level, to boost the number of players participating and to help the development of the game.

Wikinews also questioned him about tattoos worn by members of the British team. In previous years, he said, only one or two forwards had tattoos, but now almost everyone has one as having tattoos is currently in fashion. He said he got his first tattoo at the age of sixteen and only recently had it removed. He also has tattoos on his right arm, depicting the logos of the Paralympics and World championships in which he competed.

Pollocks’s team begins its London campaign on August 30, against the Germany men’s national wheelchair basketball team.

Saturday, June 13, 2009

Yesterday, Norwegian news outlets reported that Defense Security Service (Forsvarets sikkerhetstjeneste [FOST]) had conducted illegal surveillance against the prime minister’s office and other government offices.

Kripos, a division of the Norwegian Ministry of Justice and the Police, did a police search of the Norwegian Ministry of Defence’s top-secret intelligence agency’s computer equipment in Jørstadmoen, after a request by the Ministry of Defense.

While remaining confident that the case will be investigated in a correct way, Norwegian Prime Minister Jens Stoltenberg stated to Aftenposten late Wednesday that “it’s important that the police now find out what actually has happened.”

Verdens Gang reported that to their knowledge, the surveillance happened in connection with FOST, having the responsibility for the computer security of key personnel within the prime minister’s office and other government offices. For practical reasons these people have been connected to the military secure lines. Sources with insight to the surveillance process explained to Aftenposten that when a possible breach of computer security is detected its protocol that the person be given a notice that he may be in process off or already have broken the security rules. A person, possible within the Prime minister’s office has most likely received such a note and has reacted to the fact that the computer traffic had been under surveillance.

Vice admiral Jan Eirik Finseth told Verdens Gang that the Defense security agency’s computer security section, reported that computer communication lines had been put under surveillance by military communications lines. Vice admiral Finseth stated to Verdens Gang that “the circumstances is of such a nature that the police [were] asked to investigate if anything of this may be illegal.”

When Wikinews contacted State attorney Petter Mandt, who leads the investigation, we received confirmation that a search in Jørstadmoen took place, but he would not comment on what was confiscated, if anything. Mandt also stated that they would not comment on any specifics or give any details on the investigation, but explained that for use of a police search there has to be more than 50% probable suspicion that something illegal may have happened. When asked if suspicion was that the prime minister’s office had been put under illegal surveillance, Mandt refused to comment and stated that he will comment on neither how many nor who the individuals involved are.

Defense political spokesperson for Socialistic left (Sv) Bjørn Jacobsen, told Wikinews that “it’s important to find out what, if anything has happened,” but that “it’s shocking that there even exist[s] a reason for a police search.” When asked what will happen if anything illegal is found to have taken place, Jacobsen responded by pointing out that in this case the prosecutors will have to decide on what to do next, but stated that “parliament will have to see if the law and regulations ha[ve] to be changed. It’s important to stop an eventual bad culture before it sticks to the walls.”

This is the second investigation of illegal government surveillance in Norway since the Lund commission’s report uncovered illegal surveillance of communist, socialist, and other persons, which the Norwegian Police Security Service deemed to be dangerous.

Wikinews was unable to get any comments from the Norwegian Military Defense when contacted.

Sunday, July 8, 2007

Installations of closed-circuit television (CCTV) security cameras into schools in the Australian state of New South Wales has alarmed teachers.

Over 50 schools in New South Wales already have surveillance cameras in playgrounds and outside dining areas. The concern from teachers arises from the pending installation of further cameras inside classrooms and also corridors.

Teachers have expressed concerns about privacy and misuse of the equipment. Senior vice-president of the New South Wales Teachers Federation, Bob Lipscombe, said that teachers are worried about the footage being used improperly, as well as the fact that both teachers and students would be filmed at work by the cameras.

The increase in security cameras being used in schools is an attempt to protect valuable schooling equipment from theft and damage, in particular computers in computer rooms. Lipscombe said that installations in computer rooms will potentially affect many teachers, as all subjects can be taught with the integration of technology.

CCTV surveillance is preferred by some schools over fitting alarm systems and physical bars on entrances to the room, as it is cheaper to install.

Lipscombe said that the Teachers Federation isn’t against CCTV systems provided they are operated properly and with appropriate consent. A solution proposed is to only have the surveillance system record during times when the room is unattended.

A spokesperson for the New South Wales Department of Education and Training has said that the footage obtained is confidential and used to assist police in investigating criminal activity.