Science & TechnologyS


Blackbox

Unknown internet 2: Could the net become self-aware?

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© ImageSource / GettyThe internet's network structure is similar to that of the human brain.
Yes, if we play our cards right - or wrong, depending on your perspective.

In engineering terms, it is easy to see qualitative similarities between the human brain and the internet's complex network of nodes, as they both hold, process, recall and transmit information. "The internet behaves a fair bit like a mind," says Ben Goertzel, chair of the Artificial General Intelligence Research Institute, an organisation inevitably based in cyberspace. "It might already have a degree of consciousness".

Not that it will necessarily have the same kind of consciousness as humans: it is unlikely to be wondering who it is, for instance. To Francis Heylighen, who studies consciousness and artificial intelligence at the Free University of Brussels (VUB) in Belgium, consciousness is merely a system of mechanisms for making information processing more efficient by adding a level of control over which of the brain's processes get the most resources. "Adding consciousness is more a matter of fine-tuning and increasing control... than a jump to a wholly different level," Heylighen says.

Clock

How your search queries can predict the future

Real-time web search - which scours only the latest updates to services like Twitter - is currently generating quite a buzz because it can provide a glimpse of what people around the world are thinking or doing at any given moment. Interest in this kind of search is so great that, according to recent leaks, Google is considering buying Twitter.

Attention

Flashback CDC to mix avian, human flu viruses in pandemic study

One of the worst fears of infectious disease experts is that the H5N1 avian influenza virus now circulating in parts of Asia will combine with a human-adapted flu virus to create a deadly new flu virus that could spread around the world.

That could happen, scientists predict, if someone who is already infected with an ordinary flu virus contracts the avian virus at the same time. The avian virus has already caused at least 48 confirmed human illness cases in Asia, of which 35 have been fatal. The virus has shown little ability to spread from person to person, but the fear is that a hybrid could combine the killing power of the avian virus with the transmissibility of human flu viruses.

Now, rather than waiting to see if nature spawns such a hybrid, US scientists are planning to try to breed one themselves - in the name of preparedness.

Rocket

Video: Launch of world's largest amateur rocket


This 11-metre-tall, 750-kilogram rocket took off on Saturday from a field outside of Price, Maryland


A 1/10th-scale model of a NASA Saturn V rocket launched successfully on Saturday, becoming what is thought to be the largest amateur rocket ever to take off and be safely recovered. The feat could herald the arrival of the first amateur rockets to reach orbit.

The 11-metre-tall, 750-kilogram rocket took off on Saturday from a field outside of Price, Maryland, near the eastern shore. It flew for roughly 20 seconds to an altitude of more than 1300 metres before segmenting and falling back to Earth beneath multiple parachutes.

The rocket, built by rocket hobbyist Steve Eves, replicates the look of the Saturn V rocket used to loft Apollo crew capsules into space. But its interior boasts newer electronics and significantly less fuel.

A rocket only slightly larger than the scale model actually made it into orbit around the Earth nearly 40 years ago. In 1971, the 13-metre-long British Black Arrow rocket lofted a small science satellite called Prospero into orbit, says engineer Henry Spencer, an amateur space historian based in Toronto, Ontario.

Satellite

Experts urge US to share data on satellite orbits

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© ESAThe US Air Force tracks more than 19,000 pieces of debris larger than 10 centimetres long. Here, satellite sizes have been exaggerated for visibility in this artist's impression of the environment in low-Earth orbit.
The US government's reluctance thus far to release precise data about the satellites it is tracking is hampering efforts to prevent collisions in space, a satellite industry executive told a congressional committee on Tuesday.

The US tracks and predicts the orbits of the world's satellites and thousands of bits of space junk as small as 10 centimetres across, using radar and telescopes on the ground. But it closely guards its most precise data, and routinely releases only lower-precision data to satellite companies and other countries.

That makes it difficult for satellite operators to predict a collision with another satellite or piece of space junk, said Richard DalBello of satellite operator Intelsat General in testimony to a congressional hearing on Tuesday about space debris and safety.

To help avoid accidents like the one in February in which a Russian communications satellite collided with an American one, some commercial operators are pooling information on the positions and orbits of their satellites, based on their own tracking data.

Saturn

Salt in Enceladus geyser points to liquid ocean

The ice plumes that bloom above Saturn's icy moon Enceladus are almost certainly rooted in a subsurface sea of liquid water.

The Cassini spacecraft flew through a plume on 9 October 2008 and measured the molecular weight of chemicals in the ice. Frank Postberg of the Max Planck Institute for Nuclear Physics in Heidelberg, Germany, and colleagues, found traces of sodium in the form of salt and sodium bicarbonate. The chemicals would have originated in the rocky core of Enceladus, so to reach a plume they must have leached from the core via liquid water. Observations from Earth in 2007 spotted no sign of sodium, casting doubt on such a subsurface sea.

Although the salt could have been leached out by an ancient ocean which since froze solid, that freezing process would concentrate most of the salt very far from the surface of the moon's ice, says Julie Castillo of NASA's Jet Propulsion Laboratory in Pasadena, California. "It is easier to imagine that the salts are present in a liquid ocean below the surface," she says. "That's why this detection, if confirmed, is very important."

Blackbox

Antimatter mysteries 3: Does antimatter fall up?

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© Martin Lee / Rex FeaturesGravity works the same way on all normal matter, but might antimatter respond differently?
Gravity, we think, works the same way on all matter. But what about antimatter?

AEGIS, a CERN experiment that has just been given the go-ahead, is designed to find out. Gravity is a relatively weak force, so the experiment will use uncharged particles to prevent electromagnetic forces drowning out gravitational effects. It will first build highly unstable pairings of electrons and positrons, known as positronium, then excite them with lasers to prevent them annihilating too quickly. Clouds of antiprotons will rip these pairs apart, stealing their positrons to create neutral antihydrogen atoms.

Pulses of these anti-atoms shot horizontally through two grids of slits will create a fine pattern of impact and shadow on a detector screen. By measuring how the position of this pattern is displaced, the strength - and direction - of the gravitational force on antimatter can be measured.

It's a clever idea, but the devil is in the detail, says AEGIS spokesman Michael Doser. "No one has ever made controlled positronium like this, nobody has ever made a positronium excited state with lasers in an environment like this and nobody has ever made an antihydrogen pulse like this."

Telescope

Vanishing matter points to back hole in Milky Way

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© Q D Wang et al / UMass Amherst / CXC / NASAThe centre of the Milky Way, as seen from NASA's Chandra X-ray Observatory. New evidence strongly suggests that there is a black hole lurking in there.
Matter and energy are vanishing without a trace at the centre of the Milky Way, providing the best evidence so far that a black hole is lurking there.

Falling into a black hole is aone-way trip - once matter or light crosses a threshold called the event horizon, it can never escape. While astronomers have identified many dark, dense objects they strongly suspect are black holes, it is difficult to prove that they possess event horizons, the defining feature of such objects. Among the proposed alternatives are dense balls of exotic matter called boson stars, which don't have event horizons.

Now Avery Broderick of the Canadian Institute of Theoretical Astrophysics and his colleagues have analysed previous infrared and radio observations of the galactic centre and put forward the strongest evidence yet that an object at our galaxy's centre does indeed have an event horizon.

The team reasoned that if the object were not a black hole, it should glow in the infrared. This is because the kinetic energy of matter hitting the object would be converted into heat. Given the rate that matter appears to be falling onto the central object, it should have a temperature of at least a few hundred Kelvin, they calculate. The resulting infrared glow would be 250 times as bright as the actual glow coming from the region containing the massive object and its disc of matter, when previously measured during quieter moments when the disc is not flaring up.

Meteor

Asteroid Threat: Call the Lawyers

Asteroid Impact
© Don DavisArtist's rendition of an Asteroid Impact
Asteroids that might threaten Earth could pose a challenge beyond the obvious, if nations can't get their act together and figure out a unified plan of action.

There are currently no known space rocks on a collision course with Earth, but with ample evidence for past impacts, researchers say it's only a matter of time before one is found to be heading our way.

A swarm of political and legal issues bedevil any national or international response, whether it's responsibility for collateral damage from deflected asteroids or the possible outcry if one country decides to unilaterally nuke the space threat.

Star

Missing planets suggest stars 'eat' their young

Planets orbiting near their stars
© Mark Garlick/HELASPlanets orbiting near their stars may not last for very long
Exoplanets that venture near their host stars are doomed to premature deaths - even before they get close enough to be ripped apart by the stars' gravity, two new studies suggest.

A star's gravity can put a nearby planet on a 'fast track' to spiralling into the star and may also cause the planet to lose much of its atmosphere, the studies say. The research may help explain why few exoplanets have been found right next to their host stars.

More than 300 exoplanets have been catalogued to date. Many are situated close to their host stars, where it is thought to be too hot for gas and dust to collapse into planets in the first place. That implies that the planets came from farther away and migrated inwards.