Science & TechnologyS


Satellite

Geriatric Pulsar Still Kicking


EurekAlert!
Thu, 26 Feb 2009 15:00 UTC
The oldest isolated pulsar ever detected in X-rays has been found with NASA's Chandra X-ray Observatory. This very old and exotic object turns out to be surprisingly active.

The pulsar, PSR J0108-1431 (J0108 for short) is about 200 million years old. Among isolated pulsars -- ones that have not been spun-up in a binary system -- it is over 10 times older than the previous record holder with an X-ray detection. At a distance of 770 light years, it is one of the nearest pulsars known.

Pulsars are born when stars that are much more massive than the Sun collapse in supernova explosions, leaving behind a small, incredibly weighty core, known as a neutron star. At birth, these neutron stars, which contain the densest material known in the Universe, are spinning rapidly, up to a hundred revolutions per second. As the rotating beams of their radiation are seen as pulses by distant observers, similar to a lighthouse beam, astronomers call them "pulsars".
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Eye 1

'Dark Cells' of Living Retina Imaged for the First Time


e! Science News
Thu, 26 Feb 2009 15:45 UTC
RPE cells
© David Williams, University of RochesterThis is a diagram of an RPE cell showing how they interact with the photoreceptors of the eye, and how their health differs in the eyes of a 3-year old and an 80-year old.
A layer of "dark cells" in the retina that is responsible for maintaining the health of the light-sensing cells in our eyes has been imaged in a living retina for the first time. The ability to see this nearly invisible layer could help doctors identify the onset of many diseases of the eye long before a patient notices symptoms. The findings are reported today's issue of Investigative Ophthalmology and Visual Science.

"Our goal is to figure out why macular degeneration, one of the most prevalent eye diseases, actually happens," says David Williams, director of the Center for Visual Science and professor in the Institute of Optics at the University of Rochester. "Macular degeneration affects one in 10 people over the age of 65, and as the average age of the U.S. population continues to increase, it is only going to get more and more common. We know these dark retinal cells are compromised by macular degeneration, and now that we can image them in the living eye, we might be able to detect the disease at a much earlier stage."

In 1997, Williams' team was the first to image individual photoreceptor cells in the living eye, using a technique called adaptive optics, which was borrowed from astronomers trying to get clearer images of stars. To image the dark cells behind the photoreceptors, however, Williams employed adaptive optics with a new method to make the dark cells glow brightly enough to be detected.
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Magnify

Wars Are Increasingly Fought Like Video Games - Sometimes Even By Teenagers. But At What Cost?

Charlie Edwards
Propect Magazine
Thu, 26 Feb 2009 10:00 UTC
A British Reaper drone taxis across a runway in southern Afghanistan. The unmanned aerial vehicle (UAV) is about the size of a light aircraft. Circling thousands of feet above the ground for hours at a time, armed with deadly hellfire missiles, it feeds live pictures to the soldiers below. But while those on the ground might have just started the evening shift in Kandahar, the drone's two-man pilot team will be watching dawn rise 7,000 miles to the west, in an air-conditioned room on Creech Air Force base in the middle of the Nevada desert.

Britain bought its first Reaper drones under an "urgent operational requirement" in October 2007, shipping the machines to Afghanistan, while dispatching a 50-strong RAF contingent of pilots and support staff to the US. But Britain's small UAV fleet is dwarfed by America's. The US now spends $0.5bn annually on drone development, and its fleet has grown from 300 to nearly 7,000 since 2002. In the last year the US military doubled the number of combat hour flown by its drone army.

In his book, Wired for War: The Robotics Revolution and Conflict in the 21st Century, Peter Singer of the Brookings Institution argues that this new generation of warrior - both human and machine - raises troubling legal and ethical questions about the nature of wars. But it is the human dimension that is most challenging.
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Telescope

Hot Solar Winds: Energy Simulation Explains Physical Mystery of the Voyager


Science Daily
Thu, 26 Feb 2009 13:00 UTC
With a new 3D-model for energy simulation scientists from Bochum and Huntsville, USA, are studying the 'physical mystery' of the Voyager. Over 30 years ago the spacecraft detected particles in solar wind which were 'hotter' than they should have been according to the existing theory expounded by the mathematician Andrey Kolmogorov in 1941.

The Bochum plasma physicists Prof. Padma Kant Shukla and Dr. Dastgeer Shaikh from the University of Alabama are thereby the first to verify by means of computer simulation that the non-linear characteristics of turbulences in the plasma carried by the solar wind differs from the familiar model for dynamic fluids. The scientists have published their results in Physical Review Letters.
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Sherlock

Submerged Ancient City to See Daylight in Bulgaria

Elena Lalova
India eNews
Thu, 26 Feb 2009 19:05 UTC
Discovered under centuries-old layers of dirt in 1948, then submerged under 20 metres of water, the ancient city of Seuthopolis is to emerge once again in a bold rescue project in Bulgaria.

The magnificently preserved city, founded by the Thracian king Seuthes III in 323 BC, was discovered in central Bulgaria during the construction of a dam on the Tundzha river.

Despite the stunning discovery, Communist authorities went ahead with the dam and created the Koprinka reservoir six years later, in 1954, flooding Seuthopolis under 150 million cubic metres of water.

Now, a 150-million-euro ($192-million) project by Bulgarian architect Jeko Tilev aims to right the wrong and expose the polis at the bottom of the reservoir to archaeologists and tourist by creating a dry well 20 metres deep and 420 metres across.
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Sherlock

Tools Unearth 13,000 Years of History

Mark Jaffe
The Denver Post
Thu, 26 Feb 2009 19:30 UTC
It turns out that the first people to get in on Boulder real estate were the Clovis - a nomadic people who lived 13,000 years ago.

We know this from a cache of Clovis tools buried beneath the lawn of biotech entrepreneur Patrick Mahaffy.

The 83 stone implements - including bi facial knives and a tool resembling a double-bitted ax - were unearthed in May by a landscaping crew.

It is one of only two known Clovis caches. The other is in Washington state.

"There is a magic to these artifacts," said Mahaffy, who backed a $7,000 analysis of the knife and ax blades.

Mahaffy said landscapers were digging out a space to build a fish pond when their shovels struck stone, unearthing the space where the tools had been buried. Reporting of the find was delayed until the analysis was complete, officials involved in the venture said.
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Grey Alien

Galaxy may be full of 'Earths,' alien life

A. Pawlowski
CNN
Wed, 25 Feb 2009 17:51 UTC
Sun
© Agency France-Presse/ Getty ImagesAn artist's impression shows a planet passing in front of its parent star. Such events are called transits.
As NASA prepares to hunt for Earth-like planets in our corner of the Milky Way galaxy, there's new buzz that "Star Trek's" vision of a universe full of life may not be that far-fetched.

Pointy-eared aliens traveling at light speed are staying firmly in science fiction, but scientists are offering fresh insights into the possible existence of inhabited worlds and intelligent civilizations in space.

There may be 100 billion Earth-like planets in the Milky Way, or one for every sun-type star in the galaxy, said Alan Boss, an astronomer with the Carnegie Institution and author of the new book The Crowded Universe: The Search for Living Planets.

He made the prediction based on the number of "super-Earths" -- planets several times the mass of the Earth, but smaller than gas giants like Jupiter -- discovered so far circling stars outside the solar system.
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Magnify

13,000 Clovis-era tool cache unearthed in Colorado shows evidence of camel, horse butchering


University of Colorado at Boulder
Thu, 26 Feb 2009 02:39 UTC
Image
© Photo by Glenn Asakawa, University of ColoradoThree stone artifacts from a 13,000-thousand-year-old Clovis-era cache unearthed recently in the city limits of Boulder, Colo. are shown by University of Colorado at Boulder anthropology Professor Douglas Bamforth and Boulder resident Patrick Mahaffy, who owns the property where the cache was found. Two of the more than 80 implements in the cache were shown to have protein residue from now-extinct North American camels and horses.
A biochemical analysis of a rare Clovis-era stone tool cache recently unearthed in the city limits of Boulder, Colo., indicates some of the implements were used to butcher ice-age camels and horses that roamed North America until their extinction about 13,000 years ago, according to a University of Colorado at Boulder study.

The study is the first to identify protein residue from extinct camels on North American stone tools and only the second to identify horse protein residue on a Clovis-age tool, said CU-Boulder Anthropology Professor Douglas Bamforth, who led the study. The cache is one of only a handful of Clovis-age artifact caches that have been unearthed in North America, said Bamforth, who studies Paleoindian culture and tools.
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Sun

Watching Venus glow in the dark


European Space Agency News
Thu, 26 Feb 2009 02:24 UTC
Image
© ESAAtmospheric investigations by Venus Express
ESA's Venus Express spacecraft has observed an eerie glow in the night-time atmosphere of Venus. This infrared light comes from nitric oxide and is showing scientists that the atmosphere of Earth's nearest neighbour is a temperamental place of high winds and turbulence.

Unfortunately, the glow on Venus cannot be seen with the naked eye because it occurs at the invisible wavelengths of infrared. ESA's Venus Express, however, is equipped with the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) instrument, which can see these wavelengths.
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Telescope

Galileo's telescope recreated


United Press International
Thu, 26 Feb 2009 02:11 UTC
Rome - An Italian team of astronomers, scientists and historians says it has built a telescope using 17th-century astronomer Galileo Galilei's original design.

The team spent two years getting the telescope ready for the International Year of Astronomy, which marks the 400th anniversary of Galileo's discoveries, including the then-heretical conclusion that the Earth revolved around the sun, not vice versa.
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