The West has become 500 percent dustier in the past two centuries due to westward U.S. expansion and accompanying human activity beginning in the 1800s, according to a new study led by the University of Colorado at Boulder.
Sediment records from dust blown into alpine lakes in southwest Colorado's San Juan Mountains over millennia indicates the sharp rise in dust deposits coincided with railroad, ranching and livestock activity in the middle of the last century, said geological sciences Assistant Professor Jason Neff, lead author on the study. The results have implications ranging from ecosystem alteration to human health, he said.
Science & Technology
On 23 March 1989, asteroid 1989FC (with the potential impact energy of over 1000 megatons, roughly the equivalent a thousand of the most powerful nuclear bombs) missed Earth by about six hours [Freedman 1995]. We first saw this fellow after closest approach. If 1989FC had come in six hours later most of us would have been killed with zero warning.
For as long as he can remember, Brad Williams has been able to recall the most trifling dates and details about his life.
SCIENTISTS have found the first evidence that a devastating meteor impact in the Middle East might have triggered the mysterious collapse of civilisations more than 4,000 years ago.
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| ©Unknown |
| satellite images of southern Iraq have revealed a two-mile-wide impact crater caused by a meteor |
ESA's Integral has made the first unambiguous discovery of high-energy X-rays coming from a rare massive star at our cosmic doorstep, Eta Carinae. It is one of the most violent places in the galaxy, producing vast winds of electrically-charged particles colliding at speeds of thousands of kilometres per second.
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| ©ESA / C. Carreau |
| This is an artist's rendition of a colliding-wind binary system. ESA's orbiting gamma-ray observatory, Integral, has made the first unambiguous discovery of high-energy X-rays coming from a colliding-wind binary system at our cosmic doorstep, Eta Carinae. It is one of the most violent places in the galaxy, producing vast winds of electrically-charged particles colliding at speeds of thousands of kilometres per second. |
When the Jules Verne Automated Transfer Vehicle (ATV) is launched in early March it will use several key spacecraft hardware items such as the docking and refuelling systems, and the Kurs radar, procured in Russia. European and Russian engineers have worked together to adapt them from their previous use on the Russian spacecraft Progress and Soyuz to the much larger 20-tonne ATV vessel.
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| ©Unknown |
| During the Jules Verne mission, the ATV will perform automated manoeuvres which are closely monitored by almost 60 controllers in Toulouse, Houston and Moscow. For the first time in history, three space centres will interact from different sides of the world. |
Although the chances of an asteroid hitting Earth appear to be small for any given year, the consequences of such an event would be monumental. The science community has come up with some ideas and proposals for ways to mitigate the threat of an incoming asteroid hitting the Earth. Some proposals suggest almost Hollywood type theatrics of launching nuclear weapons to destroy the asteroid, or slamming a spacecraft into a Near Earth Object to blow it apart. But other ideas employ more simple and elegant propositions to merely alter the trajectory of the space rock. One such plan uses a two-piece solar sail called a solar photon thruster that draws on solar energy and resources from the asteroid itself.
Aimed at providing mankind with a Noah's Ark of food in the event of a global catastrophe, an Arctic "doomsday vault" filled with samples of the world's most important seeds will be inaugurated here Tuesday.
European Commission President Jose Manuel Barroso and Nobel Peace Prize winning environmentalist Wangari Matai will be among the personalities present at the inauguration of the vault, which has been carved into the permafrost of a remote Arctic mountain, just some 1,000 kilometres (620 miles) from the North Pole.
European Commission President Jose Manuel Barroso and Nobel Peace Prize winning environmentalist Wangari Matai will be among the personalities present at the inauguration of the vault, which has been carved into the permafrost of a remote Arctic mountain, just some 1,000 kilometres (620 miles) from the North Pole.
Researchers have found the genetic basis of two distinct forms of inherited hair loss, opening a broad path to treatments for thinning locks, according to a pair of studies released Sunday.
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| ©AFP/File/Mehdi Fedouach |
| A bald model displays an outfit at a fashion show. Researchers have found the genetic basis of two distinct forms of inherited hair loss, opening a broad path to treatments for thinning locks, according to a pair of studies released Sunday. |
Geologists at the University of Leicester have solved a puzzle found in rocks half a billion years old.
Some of the most important fossil beds in the world are the Burgess Shales in the Canadian Rockies. Once an ancient sea bed, they were formed shortly after life suddenly became more complex and diverse -- the so-called Cambrian explosion -- and are of immense scientific interest.
Some of the most important fossil beds in the world are the Burgess Shales in the Canadian Rockies. Once an ancient sea bed, they were formed shortly after life suddenly became more complex and diverse -- the so-called Cambrian explosion -- and are of immense scientific interest.
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| ©University of Leicester |
| Illustration of what life might have been like shortly after the Cambrian explosion in what is now the Canadian Rockies. |
Comment: The researchers present a reasonable explanation for a dust increase, but we want to offer additional information for your consideration.
From Tunguska, the Horns of the Moon and Evolution by Laura Knight-Jadczyk. Post excerpt made by Laura Knight-Jadczyk in forum thread Cold, bad harvest, famine and then the Black Death. From Cosmic Turkey Shoot by Laura Knight-Jadczyk.