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.

Friday, April 12, 2013

On Wednesday, the Internet hacking collective Anonymous vowed to publish the names of the four suspects involved in the alleged rape of Canadian Rehtaeh Parsons, who committed suicide last week.

A message sent to Royal Canadian Mounted Police (RCMP) by the hacktivist group called “for immediate legal action” in the case, citing that “If we [Anonymous] were able to locate these boys within 2 hours, it will not be long before someone else finds them.”

This latest operation by the group, dubbed “Operation Justice For Rehtaeh”, led to expression of concern among the members of the RCMP. In an interview with the National Post, Nova Scotia Justice Minister Ross Landry spoke of the dangers of releasing this crucial information in this ongoing investigation, “We don’t want another child taking their life because some vigilante group think it’s OK … maybe it’s a wrong name — then what would they do to someone?”

The 17-year-old Parsons was taken off life support on Sunday following an attempt to take her own life days before. Her mother erected a Facebook page celebrating the life of her daughter as well as acknowledging the true reasons for her daughters tragic passing, “Rehtaeh is gone today because of the four boys that thought that raping a 15-year-old girl was okay, and to distribute a photo to ruin her spirit and reputation would be fun.”

Saturday, June 27, 2009

The death of Michael Jackson on Thursday has caused retail demand for his songs and for memorabilia to increase.

Yesterday, the top nine selling items at Apple’s iTunes Store were albums by Jackson, with first and second being a “hits” album and the 1982 album Thriller.

Amazon.com similarly reported selling more Jackson merchandise in the 24 hours following his death than it had sold in the preceding 11 years, and that sales of Jackson CDs accounted for 60% of its total business on Thursday. Yesterday morning the top seller in the album chart for Amazon’s U.K. division was Off the Wall, followed by Bad and Thriller in second and third places, respectively.

Many stores, including Graywhale CD Exchange in Salt Lake City, several record stores in Danville, Virginia, and many retailers in New Zealand, have all reported selling out of Jackson’s CDs and DVDs. The flagship store of Tower Records Japan, in Shinjuku, sold out of several of Jackson’s DVDs and ran low on several other items including CDs. The Danville Register Bee recommended to its readers that if they had record players they should investigate antique and charity shops, after one antique shop reported discovering three Jackson Five vinyl albums in its basement.

The effect of the increase in sales had an effect on stock prices. Midday yesterday, Apple shares rose around 2%, Amazon shares rose around 1.3%, and eBay shares rose by 0.64%. Stock market analysts predict that this will be a short-term effect, however. Scott Fullman, an investment strategist at WJB Capital Group in New York, stated “This is going to be one of these events that will have an immediate impact and then wane out in a week or two.”.

In Las Vegas, 21 items of Jackson memorabilia, including handwritten lyrics for Jackson’s song “Bad” and the shirt that Jackson wore on his Victory Tour in 1984, sold at auction yesterday at the Planet Hollywood Resort and Casino for a total of USD$205,000, with the shirt, at USD$52,500 the most expensive individual item.

eBay has reported an increase in individuals auctioning Jackson memorabilia. These range from records to a Fedora hat signed by Jackson.

Also for sale on eBay and elsewhere are tickets to the This Is It concerts, at the O2 arena, where Jackson had been scheduled to perform. Ticket sellers such as Ticketmaster, Seatwave, and AEG Live have announced that they will be refunding concert tickets. But under standard contract law such refunds only apply to the original purchasor of the ticket, who dealt with the ticket companies directly. Anyone buying a ticket on eBay only has recourse against the seller on eBay that they bought from, and even then only if it was explicitly stated in the terms and conditions of the particular eBay sale that a refund was available.

At the 2009 Glastonbury Festival, stalls have been selling commemorative T-shirts to Festival attendees, with various different slogans including “Michael Jackson R.I.P 1958–2009” and “I was at Glasto 09 when Jacko died”. T-shirt vendors also appeared outside of the UCLA Medical Center where paramedics took Jackson, proferring for USD$10 T-shirts with the slogan “in loving memory of Michael Jackson” and a silhouette of Jackson, although they had few takers.

In Union Square in New York, one street artist was selling hand-made buttons that have pictures of Jackson’s album covers on them. In Times Square, another T-shirt vendor was selling T-shirts printed with copies of the front page of USA Today that reported Jackson’s death.

One observer, Allison Southwick (a Better Business Bureau spokeswoman), commented “I’m honestly expecting to see a Web site pop up by the end of the day selling Michael Jackson commemorative plates.” Whilst such commemorative plates have yet to appear, collectors have been offering commemorative stamps of Jackson for sale on eBay and elsewhere. Several commemorative stamps of Jackson already exist. Saint Vincent and the Grenadines issued $5, $2, $1, and 60¢ Michael Jackson stamps in 1985, as part of its Leaders Of The World series. Tanzania issued a 350s stamp, part of a Famous Black Entertainers set, in 1990. Guinea issued a 500f stamp in 1991. St Vincent issued another $2 Jackson stamp in 1991, as part of Famous Entertainers series. And Grenada issued a 60¢ Jackson stamp, part of its Gold Record Winners series in 1992.

Gore Vidal once remarked of the death of rival Truman Capote that it was a “good career move”. The death of an artist does serve to increase the popularity of their works. People have speculated whether this will be a temporary or a permanent thing for Jackson.

Jim Lentz, who is the Chief Operating Officer of American Royal Arts (a memorabilia dealership in Boca Raton), asked “Is he Elvis or Marilyn Monroe, or is he Mike Tyson?”.

Elvis Presley died at 42, officially of heart failure. Stores sold out of his records and souveniers within hours of the news of his death. In the 20 years following his death, RCA Records sold approximately 400 million of his recordings.

In the days and weeks immediately following Presley’s death, RCA had to sub-contract pressing to other companies, as it was unable by itself to keep up with demand. Sony Corporation announced yesterday that it had received “unprecedented” levels of orders for CDs of Jackson’s music, and was considering boosting production. It had received 150,000 orders for CDs at its music unit in Tokyo. “The amount is unprecedented for one day and we think we need to consider increasing the production of CDs that we plan to sell from July.” said a spokesman for the company. Amazon has been informing customers buying Jackson CDs that they might have to wait between 1 and 3 weeks for their orders to be shipped.

Saturday, March 14, 2015

This weekend saw the opening of two new exhibitions at Edinburgh’s National Gallery of Modern Art. Wikinews attended Thursday’s press preview for the event where a full contingent of the capital’s press turned out to see the striking collection of paintings, photographs, and other works. Presented below are a selection of images captured at the preview.

REFLECTIONS: A Series of Changing Displays of Contemporary Art, billed as a showcase of a “diverse range of internationally-renowned contemporary and modern artists” is to display major works from the Gallery’s permanent collection, alongside important loans. Alongside this broad range of works, a three-room display of pieces on-loan from the Roy Lichtenstein Foundation — with a dramatic painted steel relief, ‘borrowed’ from the Tate in London — runs from March 14 through to January 10 next year.

Admission to both exhibitions is free; being located in Dean, to the north-west of Edinburgh’s city centre, a free Gallery bus service is available.

Saturday, June 28, 2008

Louisiana Republican Governor Bobby Jindal signed a controversial bill hailed by intelligent design supporters, such as the Discovery Institute, and Louisiana Family Forum, a creationist group. Critics of the bill, including several major science organizations, say it allows for the teaching of “creationism” in public schools.

The law, Louisiana Science Education Act, allows teachers to use “supplemental materials” when discussing evolution, but it does not state what the materials would be.

Citing the 1987 Supreme Court ruling in Edwards v. Aguillard, “Louisiana has a long and unfortunate history of trying to substitute dogma for science in classrooms,” said Reverend Barry W. Lynn, an executive director for Americans United for Separation of Church and State. In addition, the American Association for the Advancement of Science, National Center for Science Education, and the Louisiana Coalition for Science opposed the bill arguing it would cause detriment to students’ education by letting in unapproved curriculum.

According to Reuters, Jindal’s office declined to comment on Friday.

Similar Academic Freedom bills have been promoted by the Discovery Institute in other states, but so far they have failed.