I can’t think of cooler ways to die, can you?
Binary Deathstar Has Earth In Its Sights
By John Pickrell
Tuesday, March 4, 2008
SYDNEY: A spectacular, rotating binary star system is a ticking time bomb, ready to throw out a searing beam of high-energy gamma rays – and Earth may be right in the line of fire.
Astronomers at the University of Sydney, in Australia, first discovered the unusual and beguilingly beautiful star system eight years ago in the Constellation Sagittarius. One member of the pair is a highly unstable star known as a Wolf-Rayet, thought to be the final stage of stellar evolution to precede a cataclysmic supernova explosion.
“When it finally explodes as a supernova, it could emit an intense beam of gamma rays coming our way”, said Peter Tuthill, lead researcher of the team that report their findings in the current Astrophysical Journal.
Vast and glowing plume
At a distance of 8,000 light-years from Earth, the pair of stars are a short hop away in galactic terms, and just one quarter of the way to the centre of our Milky Way galaxy.
The researchers took images of the system, known as WR 104, over a period of eight years using Hawaii’s Keck Telescope. These images reveal a vast and glowing plume of heated dust and gas, billowing out in a spiral as the stars rotate once every eight months. This ‘tail’ is up to 30 billion kilometres long.
But something curious about the images caught the attention of the experts.
“Viewed from Earth, the rotating tail appears to be laid out on the sky in an almost perfect spiral. It could only appear like that if we are looking nearly exactly down on the axis of the binary system,” said Tuthill.
This means we are peering down the barrel of the gun, as when binary supernovae go off, all their energy is focussed into a narrow beam of wildly destructive gamma ray radiation that emanates (both up and down) from the poles of the system.
“If such a gamma-ray burst happens, we really do not want Earth to be in the way,” he said. “I used to appreciate this spiral just for its beautiful form, but now I can’t help a twinge of feeling that it is uncannily like looking down a rifle barrel.”
Sterilising effect
Though the risk may be remote, there is evidence that gamma ray bursts have swept over the planet at various points in Earth’s history with a devastating effect on life.
A 2005 study showed that a gamma-ray burst originating within 6,500 light-years of Earth could be enough to strip away the ozone layer and cause a mass extinction. Researchers led by Adrian Melott at the University of Kansas in Lawrence, U.S., suggest that such an event may have been responsible for a mass extinction 443 million years ago, in the late Ordovician period, which wiped out 60 per cent of life and cooled the planet.
Further research would be required to determine if we are exactly in line with the axis of the system – but even if we are, we probably still have hundreds of thousands of years to come up with a solution, said Tuthill.
http://www.cosmosmagazine.com/node/1878
Try this headline: Black Hole Eats Earth
By Dennis Overbye
Saturday, March 29, 2008
More strife in Iraq. U.S. financial system in crisis. Rice prices soar.
None of these headlines will matter a bit, though, if two men pursuing a lawsuit in a court in Hawaii turn out to be right. They think a giant particle accelerator that will begin smashing protons together outside Geneva this summer might produce a black hole that will spell the end of the Earth – and maybe the universe.
Scientists say that is very unlikely – though they have done some checking just to make sure.
The world’s physicists have spent 14 years and $8 billion building the Large Hadron Collider, in which the colliding protons will recreate energies and conditions last seen a trillionth of a second after the Big Bang. Researchers will sift the debris from these primordial recreations for clues to the nature of mass and new forces and symmetries of nature.
But Walter Wagner and Luis Sancho contend that scientists at the European Center for Nuclear Research, or CERN, have played down the chances that the collider could produce, among other horrors, a tiny black hole, which, they say, could eat the Earth. Or it could spit out something called a “strangelet” that would convert our planet to a shrunken dense dead lump of something called “strange matter.” Their suit also says CERN has failed to provide an environmental impact statement as required under the U.S. National Environmental Policy Act.
Although it sounds bizarre, the case touches on a serious issue that has bothered scholars and scientists in recent years – namely how to estimate the risk of new groundbreaking experiments and who gets to decide whether or not to go ahead.
The lawsuit, filed March 21 in U.S. District Court in Honolulu, seeks a temporary restraining order prohibiting CERN from proceeding with the accelerator until it has produced a safety report and an environmental assessment. It names the U.S. Department of Energy, the Fermi National Accelerator Laboratory, the National Science Foundation and CERN as defendants.
According to a spokesman for the Justice Department, which is representing the Department of Energy, a scheduling meeting has been set for June 16.
Why should CERN, an organization of European nations based in Switzerland, even show up in a Hawaiian courtroom?
In an interview, Wagner said, “I don’t know if they’re going to show up.” CERN would have to voluntarily submit to the court’s jurisdiction, he said, adding that he and Sancho could have sued in France or Switzerland, but to save expenses they had added CERN to the docket here. He claimed that a restraining order on Fermilab and the Energy Department, which helps to supply and maintain the accelerator’s massive superconducting magnets, would shut down the project anyway.
James Gillies, head of communications at CERN, said the laboratory as of yet had no comment on the suit. “It’s hard to see how a district court in Hawaii has jurisdiction over an intergovernmental organization in Europe,” Gillies said.
“There is nothing new to suggest that the LHC is unsafe,” he said, adding that its safety had been confirmed by two reports, with a third on the way, and would be the subject of a discussion during an open house at the lab on April 6.
“Scientifically, we’re not hiding away,” he said.
But Wagner is not mollified. “They’ve got a lot of propaganda saying it’s safe,” he said in an interview, “but basically it’s propaganda.”
In an e-mail message, Wagner called the CERN safety review “fundamentally flawed” and said it had been initiated too late. The review process violates the European Commission’s standards for adhering to the “Precautionary Principle,” he wrote, “and has not been done by ‘arms length’ scientists.”
Physicists in and out of CERN say a variety of studies, including an official CERN report in 2003, have concluded there is no problem. But just to be sure, last year the anonymous Safety Assessment Group was set up to do the review again.
“The possibility that a black hole eats up the Earth is too serious a threat to leave it as a matter of argument among crackpots,” said Michelangelo Mangano, a CERN theorist who said he was part of the group. The others prefer to remain anonymous, Mangano said, for various reasons. Their report was due in January.
This is not the first time around for Wagner. He filed similar suits in 1999 and 2000 to prevent the Brookhaven National Laboratory from operating the Relativistic Heavy Ion Collider. That suit was dismissed in 2001. The collider, which smashes together gold ions in the hopes of creating what is called a “quark-gluon plasma,” has been operating without incident since 2000.
Wagner, who lives on the Big Island of Hawaii, studied physics and did cosmic ray research at the University of California, Berkeley, and received a doctorate in law from what is now known as the University of Northern California in Sacramento. He subsequently worked as a radiation safety officer for the Veterans Administration.
Sancho, who describes himself as an author and researcher on time theory, lives in Spain, probably in Barcelona, Wagner said.
Doomsday fears have a long, if not distinguished, pedigree in the history of physics. At Los Alamos before the first nuclear bomb was tested, Emil Konopinski was given the job of calculating whether or not the explosion would set the atmosphere on fire.
Lisa Randall, a Harvard physicist whose work helped fuel the speculation about black holes at the collider, pointed out in a paper last year that black holes would not be produced at the collider after all, although other effects of so-called quantum gravity might appear.
As part of the safety assessment report, Mangano and Steve Giddings of the University of California, Santa Barbara, have been working intensely for the last few months on a paper exploring the possibilities of black holes. They think there are no problems but are reluctant to talk about their findings until they have been reviewed, Mangano said.
http://www.iht.com/articles/2008/03/29/europe/physics.php
