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Giant asteroid rocked Antarctica
Near Earth Object Information Centre | 8/20/2004 | staff
Posted on 10/17/2004 9:26:51 PM PDT by SunkenCiv
http://www.freerepublic.com/focus/f-bloggers/1248406/posts
The Eltanin Impact Crater
Geological Society of America | October 27-30, 2002
Christy A. Glatz, Dallas H. Abbott, and Alice A. Nunes
Posted on 10/17/2004 9:46:13 PM PDT by SunkenCiv
http://www.freerepublic.com/focus/f-bloggers/1248414/posts
Forests Frozen In Time
Science Frontiers (#51) | May-Jun 1987 | William R. Corliss
Posted on 01/15/2005 3:53:29 PM PST by SunkenCiv
http://www.freerepublic.com/focus/chat/1321587/posts
Antarctica 'Lost World' Found
CNN | 08/14/2005
Posted on 08/15/2005 1:01:20 PM PDT by TerP26
http://www.freerepublic.com/focus/f-news/1463873/posts
The Big Splash:
A Scientific Discovery That Revolutionizes the Way We View the Origin of Life,
the Water We Drink, the Death of the Dinosaurs, the Creation of the Oceans,
the Nature of the Cosmos, and the Very Future of the Earth Itself
by Louis A. Frank
with Patrick Huyghe
Sigwarth and I analyzed over 10,000 images and learned a good deal about the black spots in the process. Our interpretation of the events continued to involve meteor impacts into Earth's upper atmosphere.By counting the spots in our images we were able to estimate the rate at which these objects appeared. This was the simplest measurement to do. We saw ten holes per minute on the daylight side of Earth. So we doubled that figure to obtain the rate of these objects over the entire face of Earth. There had to be about twenty such objects entering the atmosphere every minute. That was an alarming number of objects.
Atmosphere's chunky soup might be coldWhen asteroids smack into Earth's atmosphere, they leave behind a soup made of tiny chucks of rock and dust. It turns out, however, that what scientists previously thought was a fine bisque of particles is more like a chunky stew - with pieces big enough to bounce sunlight away from Earth's surface and possibly cause cooling trends, said Dick Spalding, a scientist at Sandia National Laboratories who is studying the process. "We caught an event near Antarctica as an outgrowth of our sensors set up to detect nuclear bursts around the globe," Spalding said. "The chief surprise was that the size of the dust particles left behind from the event were larger than we thought they would be. The prevailing wisdom was that the particles from an asteroid hitting the Earth would be nanometer sized, but we found instead they were micron sized." ... "Particles that are micron sized interact with sunlight more efficiently, so it appears that would cause an impact on climate from these particles left in the upper atmosphere," said Peter Brown, an associate professor of physics and astronomy at the University of Western Ontario. Micron-sized dust from asteroids 30 feet wide or bigger can linger in the atmosphere for a few weeks before making its way to the ground. Over those weeks, scientists think the dust could cause regional cooling and temporary climate fluctuations on the ground, Brown said.
by Sue Vorenberg
Albuquerque Tribune
September 5, 2005
earlier topic:
Scientists Probe Asteroid Crash
Brisbane Courier Mail | 25 August 2005 | Robyn Grace
Posted on 08/26/2005 7:00:38 AM PDT by Our_Man_In_Gough_Island
http://www.freerepublic.com/focus/f-news/1471169/posts
