Author Topic: Technology and Science News  (Read 5833 times)

Offline wajahat

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Re: Technology and Science News
« Reply #8 on: March 29, 2013, 10:31:22 pm »
New Evidence Ancient Asteroid Caused Global Firestorm On Earth
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Mar. 27, 2013 — A new look at conditions after a Manhattan-sized asteroid slammed into a region of Mexico in the dinosaur days indicatesthe event could have triggered a global firestorm that would have burned every twig, bush and tree on Earth and led to the extinction of 80 percent of all Earth's species, says a new University of Colorado Boulder study.
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Led by Douglas Robertson of the Cooperative Institute for Research in Environmental Sciences, or CIRES, theteam used models that show the collision would have vaporized huge amounts of rock that were then blown high above Earth's atmosphere. The re-entering ejectedmaterial would have heated the upper atmosphere enough to glow red for several hours at roughly 2,700 degrees Fahrenheit -- about the temperature of an oven broiler element -- killing every living thing not sheltered underground or underwater.
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The CU-led team developed an alternate explanation for the fact that there is little charcoal found at the Cretaceous-Paleogene, or K-Pg, boundary some 66 million years ago when the asteroid struck Earth and the cataclysmic fires are believed to have occurred. The CU researchers found that similar studies had corrected their data for changing sedimentation rates. When the charcoal data were corrected for the same changing sedimentation rates they show an excess of charcoal, not a deficiency, Robertson said.
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"Our data show the conditions back then are consistent with widespread fires across the planet," said Robertson, a research scientist at CIRES, which is a joint institute of CU-Boulder and the National Oceanic and Atmospheric Administration."Those conditions resulted in 100 percent extinction rates for about 80 percent of all life on Earth."
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A paper on the subject was published online this week in the Journal of Geophysical Research-Biogeosciences , a publication of the American Geophysical Union. Co-authors on the study include CIRES Interim Director William Lewis,CU Professor Brian Toon of the atmospheric and oceanic sciences department and the Laboratory for Atmospheric and Space Physics and Peter Sheehan of the Milwaukee Public Museum in Wisconsin.
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Geological evidence indicates the asteroid collided with Earth about 66million years ago and carved the Chicxulub crater in Mexico's Yucatan Peninsula that is more than 110 miles in diameter. In 2010, experts from 33 institutions worldwide issued a report that concluded the impact at Chicxulub triggered mass extinctions, including dinosaurs, at the K-Pg boundary.
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The conditions leading to the global firestorm were set up by the vaporization of rock following the impact, which condensed into sand-grain-sized spheres as they rose above the atmosphere. As the ejected material re-entered Earth's atmosphere, it dumped enough heat in the upper atmosphere to trigger an infrared "heat pulse" so hot it caused the sky to glow red for several hours, even though part of the radiation was blocked from Earthby the falling material, he said.
But there was enough infrared radiation from the upper atmosphere that reached Earth's surface to create searing conditions that likely ignited tinder, including dead leaves and pine needles. If a person was on Earth back then, it would have been like sitting in a broiler oven for two or three hours, said Robertson.
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The amount of energy created by theinfrared radiation the day of the asteroid-Earth collision is mind-boggling, said Robertson. "It's likely that the total amount of infrared heat was equal to a 1 megaton bomb exploding every four miles over the entire Earth."
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A 1-megaton hydrogen bomb has about the same explosive power as 80 Hiroshima-type nuclear bombs, hesaid. The asteroid-Earth collision is thought to have generated about 100 million megatons of energy, saidRobertson.
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Some researchers have suggested that a layer of soot found at the K-Pg boundary layer roughly 66 million years ago was created by the impact itself. But Robertson and his colleagues calculated that the amount of soot was too high to have been created during the massive impact event and was consistent with the amount that would be expected from global fires.
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Re: Technology and Science News
« Reply #8 on: March 29, 2013, 10:31:22 pm »

Offline wajahat

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Re: Technology and Science News
« Reply #9 on: March 30, 2013, 10:53:37 am »
Scientists Develope Harry potter Style Invisibility Cloak.
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28th March 2013, washington mein shaya hone wale ek Physics Journal mein ye information di gai hy.
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Scientists ne bri mehnat k bad ek aesa cloak bnaya hy jis mein lapait kar cheezon ko invisible kiya ja skta hy.
Cloak yani ek kapra jisy lapaita ja sake jis mein kuch chupaya ja sake.
Filhal ye cloak sirf buht km size ki cheezon ko invisible kr skta hy kuch centemeter ki cheezon ko aur wo b buht kam darjay ki light mein. Jese k microwave light.
Insani ankh se kuch ni chupa saka ye cloak par developers ka kehna hy k buht jald wo is qabil ho jayen ge k insani ankh se b cheezen invisible kar payen ge.
Ye history mein pehli dafa huwa hy is se pehle har dafa ye try ki gai k invisible macanism ko is theory pe bnane ki try ki gai k wo apne ird gird k mahol ka image reflect kre par ye hamesha nakam huwa.
Ab ye new cloak is theory pe bnaya gya hy k light ek wave hy jisko disturb kar k uska rasta badla ja skta hy aur youn wo cheezon ko roshan karne se mehroom ho skti hy.
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Re: Technology and Science News
« Reply #9 on: March 30, 2013, 10:53:37 am »

Offline shikra22

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Re: Technology and Science News
« Reply #10 on: March 30, 2013, 11:05:55 am »
Good and Informative topic
 :rockon:
Iss shikray se koi parinda nahi bach sakta

Offline wajahat

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Re: Technology and Science News
« Reply #11 on: March 30, 2013, 11:29:59 am »
Good and Informative topic
 :rockon:
Thanx bro.
Par main akela ni sanbhal skta isy. Ap sb b is mein participate kren.
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Offline wajahat

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Re: Technology and Science News
« Reply #12 on: March 30, 2013, 07:29:56 pm »
Three astronauts blast off on express ride to International Space Station.
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A crew of two Russians and an American blasted off today on a Russian rocket for the International Space Station (ISS), in a trip scheduled to be the fastest ever manned journey to the facility.
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Ye ab tak ka kiya jane wala sb se taiz tareen space ka safar hy.
Ye karnama 29 march 2013 ko sar anjam dia geya.
Is kamyabi ne space race ko ek naya mor dia hy.
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Offline nightrider

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Re: Technology and Science News
« Reply #13 on: March 30, 2013, 08:14:49 pm »
very nice and informative topic wajaht bhai. koshish kero k urdu main bhi information post ker sako. jaisy last ki kuch post ki hain aapn.
overall nice topic. keep it up bro.
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Offline DesiGirl

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Re: Technology and Science News
« Reply #14 on: March 30, 2013, 09:12:22 pm »
very nice topic n a lot of information in it so far but i am afraid it will be least viewed one :-S

Offline wajahat

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Re: Technology and Science News
« Reply #15 on: March 30, 2013, 09:22:38 pm »
very nice and informative topic wajaht bhai. koshish kero k urdu main bhi information post ker sako. jaisy last ki kuch post ki hain aapn.
overall nice topic. keep it up bro.
Thanx bro. Aur apke mashware pe amal krnga .
Andhera hai Buhat....
Aao Dil Jalate Hain

 

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