Posted on 08/23/2004 6:58:34 AM PDT by blam
Antarctic craters reveal strike
The asteroid may have raised sea levels by up to 60cm
Scientists have mapped enormous impact craters hidden under the Antarctic ice sheet using satellite technology. The craters may have either come from an asteroid between 5 and 11km across that broke up in the atmosphere, a swarm of comets or comet fragments.
The space impacts created multiple craters over an area of 2,092km (1,300 miles) by 3,862km (2,400 miles).
The scientists told a conference this week that the impacts occurred roughly 780,000 years ago during an ice age.
When the impacts hit, they would have melted through the ice and through the crust below.
Professor Frans van der Hoeven, from Delft University in the Netherlands, told the International Geographical Union Congress in Glasgow that the biggest single strike seared a hole in the ice sheet roughly 322km (200 miles) by 322km.
Impact melt
This would have melted about 1% of the ice sheet, raising water levels worldwide by 60cm (2ft).
The research suggests that an asteroid the size of the one blamed for killing off the dinosaurs 65 million years ago could have struck Earth relatively recently.
Early humans would have been living in Africa and other parts of the Old World at the time of the strikes.
But the impacts would have occurred during an ice age, so even tidal waves would have been weakened by the stabilising effect of icebergs on the ocean.
The craters were resolved using satellite data to map gravity anomalies under the ice sheet.
Hideous logic disconnection in panel two.
So, I believe this was a thread about an IMPACT EVENT in ANTARCTICA and not a theological discussion thread.
Only for one post, it was hijacked very quickly.
not a theological discussion thread
There is a whole forum for that stuff.
I have in the past suggested a "science forum," but now recognize that wouldn't stop the thread spoilers.
When I die, you will cease to exist.
There are hugh impact craters in Antarctica under the ice. That is the topic of this thread.
Ah, I am referring to the poster-in-question's predicted tenure at FR.
Can't you smell agent provacateur? Check out the tag line and the date of entry - even the username reeks. Don't let it pull your chain.
A "Find The Satellite Pictures somewhere ONLINE Later" BUMP!
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I had no idea that icebergs had a stabilizing effect on the ocean. I don't believe it.Good, because they don't have any such effect. If I were to nitpick, I'd also heap abuse on the article's "tidal wave" -- tsunamis aren't "tidal waves". ;')
Unearthed: The Humble Origins Of World Diplomacy (Hittites)
Independent (UK) ^ | 1-19-2003 | David Keys
Posted on 01/18/2003 2:51:58 PM PST by blam
http://www.freerepublic.com/focus/f-news/825168/posts?page=31#31
[and, from the fringe]
Mystery of the Eltanin Antenna
Unknown Country ^ | 21-Jul-2001 | WHITLEY STRIEBER
Posted on 01/21/2003 4:27:46 PM PST by vannrox
http://www.freerepublic.com/focus/f-news/826883/posts
My completely uninformed opiniun is that impacts are far more common and less deadly then is currently thought. Locally (couple thousand miles) very bad but not the cause of great extinctions. Plese do not ask my to back that up. I can't.
Bump! Bump! Bump!
http://radiocity.dynip.com/RadioCity/HtmlPages/reporter.htm
Thanks for the ping!
Asteroids and TsunamisTsunami can travel at around 400 mph in deep water. When they reach shallow water they slow down, and that's when the real danger begins. The front of the wave slows first and the effect is like a pile-up on a freeway, with the rear of the wave catching up to the front. The wave increases in height from this bunching effect. The final height of the wave depends on several factors, but the shape of the sea floor has the greatest impact.
by Michael Paine
5 November 1999Out ThereIn the spring of 1986, I published my explanation of the black spots in a scientific journal: The Earth's atmosphere was being bombarded by house-sized, water-bearing objects traveling at 25,000 mph, one every three seconds or so. That's 20 a minute, 1,200 an hour, 28,800 a day, 864,000 a month and more than 10 million a year. These objects, which I call "small comets," disintegrate high above the Earth and deposit huge clouds of water vapor into the upper atmosphere. Over the history of this planet, the small comets may have dumped enough water to fill the oceans and may have even provided the organic ingredients necessary for life on Earth.
by Louis A. Frank
and Patrick Huyghe
Scientists reacted to my announcement as if I had plowed through the sacred field of established science with a bulldozer. I had. If the small comets were real, one scientist commented, textbooks in a dozen sciences would have to be rewritten... I spent more than a year answering the objections of critics. But I didn't convince them. It was 10,000 to 1 -- actually 2, myself and John Sigwarth, whose task as my graduate student assistant had been to help me resolve this black-spot mystery. "We have taken a representative poll of current opinion in this field," an editor at Nature wrote in rejecting a small-comet paper we submitted to them in 1988, "and the verdict goes against you." It was my first encounter with taking polls as a way of doing science.
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