In a bizarre finding that has disrupted the current understanding of the universe, astronomers have detected evidence of a massive gravitational force beyond the horizon of the observable universe. What’s being called a dark flow appears to be pulling vast clusters of galaxies toward a 20-degree-wide patch of sky between the constellations of Centaurus and Vela. “It does fly in the face of everything we know,” said astronomer Dale Kocevski…. “I’m sure it’s going to be controversial” [Discovery News].
When scientists talk about the observable universe, they don’t just mean as far out as the eye, or even the most powerful telescope, can see. In fact there’s a fundamental limit to how much of the universe we could ever observe, no matter how advanced our visual instruments. The universe is thought to have formed about 13.7 billion years ago. So even if light started travelling toward us immediately after the Big Bang, the farthest it could ever get is 13.7 billion light-years in distance. There may be parts of the universe that are farther away (we can’t know how big the whole universe is), but we can’t see farther than light could travel over the entire age of the universe [SPACE.com].
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A physicist in Virginia has been arrested and charged with violating arms control laws by selling rocket technology information to China, which helped the country’s burgeoning space program. He has also been charged with bribing a Chinese official to win a contract for a company he represented. Quan-Sheng Shu, 68, a naturalized U.S. citizen who was born in Shanghai, was arrested Wednesday morning and made an initial appearance that afternoon in U.S. District Court in Norfolk…. Shu appeared to be shaking and bewildered at his court appearance [Virginian-Pilot]. If convicted, Shu faces up to 25 years of jail time.
The arrest came at an awkward moment for the Chinese government, which spent today celebrating the successful launch of the Shenzhou 7 spacecraft carrying a full crew of three astronauts, one of whom will perform China’s first space walk in the coming days. While the technological data that Shu allegedly sold wasn’t used in the rocket that launched the Shenzhou 7, the juxtaposition of events undercuts the message the Chinese government hoped to broadcast today: that the country has come into its own as a mature, space-faring nation, and that it needs no outside assistance to achieve its goals.
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Chrysler, the smallest of Detroit’s Big Three automakers, surprised the industry this week by revealing three new electric vehicles, the first of which it plans to begin shipping to dealers in late 2010. In unveiling a minivan, a Jeep Wrangler and a sports car, Chrysler’s executives spelled out plans for a future in which most, if not all, automobiles would use electric motors for propulsion — essentially sounding the death knell for the internal-combustion engine [Los Angeles Times].
The car company has struggled financially over the past decade, so the ambitious plan surprised analysts, many of whom thought Chrysler lacked the size and financial resources to develop an electric car on its own [The New York Times]. By announcing that its first electric models will hit showrooms in 2010, Chrysler puts itself in direct competition with General Motors, which has a similar timeline for its electric car, the Chevy Volt, which was unveiled last week. Nissan is also working on several electric cars of its own.
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In the middle of the Australian outback along a mountain chain called the Flinders Ranges, researchers have discovered a 650 million year old reef that was once underwater. Researchers say the tiny fossils they’ve already found in the ancient reef may be the earliest examples of multicellular organisms ever found, and may answer questions about how animal life evolved.
Researcher Malcolm Wallace explains that the oldest-known animal fossils are 570 million years old. The reef in the Flinders Ranges is 80 million years older than that and was, he said, “the right age to capture the precursors to animals” [The Times]. The first fossils discovered in the reef appear to be sponge-like multicellular organisms that resemble tiny cauliflowers, measuring less than an inch in diameter, but Wallace cautions that the creatures haven’t been thoroughly studied yet. The reef’s discovery was announced at a meeting of the Geological Society of Australia this week.
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Astronomers believe they’ve found evidence of a massive collision between two planets in a mature solar system, shaking theories that such pileups only occur in young systems where planetary orbits aren’t yet stabilized. Says lead researcher Benjamin Zuckerman: “It’s as if Earth and Venus collided with each other…. Astronomers have never seen anything like this before; apparently major, catastrophic, collisions can take place in a fully mature planetary system” [Reuters].
Researchers base their theory on observations of vast clouds of dust and debris in a binary star system 300 light years away in the Aries constellation. Initially, they had a different idea about why the system contains 1 million times more dust that our own solar system: They had assumed it was a young star, just a few hundred million years old, and the debris was leftovers from planet formation. But earlier this year, another study showed the star was actually a binary pair, and that the stars were billions of years old [SPACE.com]. That finding forced astronomers to rethink what could have caused the dust; in older systems, most debris has either been consolidated into planets or pushed away by solar winds.
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Alarming but preliminary reports of methane gas bubbling up from the Arctic Ocean have raised the specter of precipitous global warming in the minds of some climate scientists.
While aboard a research ship sailing off the coast of Siberia, scientists observed high levels of methane in the water, and then spotted several areas where the gas bubbles were fizzing up from the ocean floor, which contains vast amounts of frozen methane. That was enough to ring the alarm bells: Methane is about 20 times more powerful as a greenhouse gas than carbon dioxide and many scientists fear that its release could accelerate global warming in a giant positive feedback where more atmospheric methane causes higher temperatures, leading to further permafrost melting and the release of yet more methane [The Independent].
While the news seems disquieting, some researchers are expressing some skepticism about the findings, which haven’t yet been published in a peer-reviewed journal. The initial word from a heap of scientists who are focused on sub-sea methane deposits, including a group that videotaped big burps of methane bubbles off Santa Barbara, Calif., a few years ago, is a note of caution about overinterpreting the Arctic bubbling and high gas concentrations as something a) new or b) driven by human-caused global warming [The New York Times, Dot Earth blog].
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The first commercial energy station powered by ocean waves started up yesterday three miles off the Portuguese coast. The machine, which resembles a giant red sea snake, generates electricity that’s transmitted via an underwater cable to the nation’s power grid. Two more machines are expected to be added in the coming weeks, allowing the “wave farm” to generate a total of 2.25 megawatts, enough to supply 1,500 households with electricity [Reuters]. If successful, a second phase will see energy generation rise to 21 megawatts from a further 25 machines providing electricity for 15,000 Portuguese homes [CNN].
Environmentalists love the idea of generating power from the natural motion of waves and tides, as the ocean’s energy is bountiful, reliable, and creates no greenhouse gases. But the technology has been slow to mature. Last year, a wave-power machine sank off the Oregon coast. Blades have broken off experimental tidal turbines in New York’s turbulent East River [The New York Times]. A problem with offshore moorings also delayed the Portuguese project for about a year. But wave power proponents say that some problems are inevitable with a new technology, and that most of the kinks have now been ironed out.
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Paleontologists have dug up the bones of a chicken-sized dinosaur that scampered through the Cretaceous forest 70 million years ago, feasting on termites and other insects. The Albertonykus borealis is believed to have lived like an anteater, using strong claws to rip apart logs for insects as food [Globe and Mail]. The dinosaur, found in fossil-rich Alberta, Canada, is the smallest ever discovered in North America.
The small dinosaur looks like a creature from a Dr. Seuss book, said [researcher Nick] Longrich, who called the findings “pretty cool.” … Most of the bones dug up in North America have been from large animals, he said. “Now that we are finally starting to find some of the smaller ones it is suggesting that our picture of the fauna is skewed. We are primarily picking up the big skeletons. They just preserve better” [CBC].
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The solar wind, a steady stream of charged subatomic particles that stream out from the sun at a speed of one million miles per hour, has dwindled to its weakest state since recording began, researchers say. While researchers already knew that solar winds fluctuate in 11-year cycles, the current doldrums trump the declines seen over the past 50 years. “We know that the sun has been this cool before, this inactive before,” said [physicist] Nancy Crooker…. “But that was prior to the Space Age, so we didn’t have actual physical measurements until now” [SPACE.com].
The data was collected by the first solar explorer, the Ulysses probe, which was launched in 1990 as a joint venture between NASA and the European Space Agency. The 17-year-old space probe, which circles the sun from a distance of about 337 million miles, has been studying the environment above and below the poles of the sun. It is just months away from shutting down because of freezing fuel [AP].
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The accident that brought the Large Hadron Collider’s particle-smashing experiments to a screeching halt on Friday will keep the collider out of action until spring 2009, officials at CERN announced today. A preliminary inquiry has revealed that it will take two months to fix the problem and restore operating conditions, and the LHC was already scheduled to shut down in the winter to reduce electrical costs.
Says CERN spokesman James Gillies: “We are not going to be done with this before the winter shutdown, so there will be no more beam in the LHC this year…. The winter shutdown will go according to schedule, which means that we start up the accelerator complex in the spring months” [AP].
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The Mars rover Opportunity is wheeling off on what could be its final mission, and is starting a two-year journey that it may not even complete. The small robot climbed out of the Victoria crater a few weeks ago, and NASA’s science team has now decided to direct Opportunity towards an even larger crater, known as Endeavor.
The 7-mile stretch between Victoria and Endeavor craters matches the total distance the rover already has covered in the 4 1/2 years since landing on the planet. “We may not get there but it is scientifically the right direction to go anyway,” said [researcher] Steve Squyres…. “This crater (Endeavor) is staggeringly large compared to anything we’ve seen before” [Reuters].
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Researchers may be able to recreate a species of giant tortoise that went extinct from the Galapagos Islands with a program of careful breeding. The new possibility hinges on the discovery that a species of giant tortoise living on the biggest island, Isabela, is very similar genetically to the extinct species, Geochelone elephantopus, which vanished from the island Floreana over a hundred years ago.
By mating Isabela tortoises that are most genetically similar to G. elephantopus, selecting the offspring that are most similar and mating those, through successive generations the species’ genetic makeup may be largely restored [The New York Times]. Says lead researcher Gisella Caccone: “We might need three or four generations to do this…. But in theory it could be done, and I think it’s pretty exciting to bring back from the dead a genome that we thought was gone” [BBC News].
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In a promising result for gene therapy, researchers have dramatically improved the vision of several patients with a rare, inherited eye condition called Leber congenital amaurosis. The early study was intended to simply test the safety of the treatment, but the patients displayed such significant improvement that researchers decided to publicize the results.
Gene therapy works on a simple principle – to replace a malfunctioning gene, and restore function to a part of the body affected by a genetic disorder. In practice, however, it has proved very difficult to find ways to introduce the new gene copies in the correct tissues, and experiments in animals have had mixed results [BBC News].
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Neanderthals living in coastal caves in Gibraltar hunted and feasted on seafood, researchers say, adding another piece of evidence to the argument that Neanderthals weren’t outmatched and driven to extinction by more skilled and sophisticated Homo sapiens. “I don’t think that the success of one or the other had to do with subsistence, with the way they hunted or fed,” [researcher Clive] Finlayson said. “There may be other factors coming into this, or it may just have been a question of luck” [National Geographic News].
The discovery of seal, dolphin and fish remains in the caves dating from 60,000 to 30,000 years ago provides the first evidence that Neanderthals ate sea mammals as well as land grub. Archaeologists found the mammals’ remains among Neanderthal hearth sites in Vanguard and Gorham’s Caves on the Rock of Gibraltar. The bones of some of the animals have cut marks that were likely made by Neanderthals using flint knives, also found on site, to cut the meat off [LiveScience].
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In a sign of China’s growing technological prowess, the Chinese space agency will soon launch its third manned mission into space. The Shenzhou 7 mission, to launch as early as Thursday, will be the first to carry a full complement of three astronauts, one of whom will perform China’s first space walk, or EVA for “extra-vehicular activity” [AP]. In 2003, China became the third nation to successfully launch astronauts into orbit, joining the United States and Russia.
The Shenzhou VII crew capsule will be boosted aloft by the Long March 2F rocket, which has 66 consecutive successful launches. During the spacewalk, a companion satellite will fly nearby to relay real-time images of the astronaut’s daring feat to the eager crowds back home. If all goes as planned, experts say the mission will be not just a technological achievement, but also a triumph of propaganda. “China wants to get the flight in full 3-D glory to maximize the publicity,” says Eric Hagt, China programme director at the World Security Institute in Washington DC. “This is going to be the Hollywood mission” [Nature News].
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