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1697.. ၾကယ္တံခြန္တစ္ခု​​ေပၚတြင္ ႀကီး​​မား​​​ေသာ ​​ေရျပင္အား​​ သိပၸံပညာရွင္မ်ား​​ ရွာ​​ေဖြ​​ေတြ႕​​ရွိ

 

     
             Hartley 2 ၾကယ္တံခြန္​​ေပၚတြင္ ကမ႓ာ​​ေပၚရွိ သမုဒၵရာ ​​ေရျပင္ထက္ ပိုမိုႀကီး​​မား​​​ေသာ ​​ေရထုတစ္ခု ရွိ​​ေန​​ေၾကာင္း​​ Natureသိပၸံဂ်ာနယ္တြင္ ထည့္​​သြင္း​​​ေဖာ္ျပခဲ့​​သည္။ Deuteriumဟု​​ေခၚသည့္​​ ရွား​​ပါး​​​ေသာ Hydrogenဓာတ္​​ေငြ႕​​ တစ္ခု တည္ရွိ​​ေနျခင္း​​​ေၾကာင့္​​ ယခုလို ​​ေရျပင္က်ယ္ ​​ေပၚ​​ေပါက္လာျခင္း​​ဟု ပညာရွင္မ်ား​​က ယံုၾကည္​​ေနသည္။ 

          ပညာရွင္မ်ား​​က ယခု​​ေတြ႕​​ရွိမႈ​​ေၾကာင့္​​ တစ္ခ်ိန္က ကမ႓ာ​​ေပၚတြင္ ​​ေရလံုး​​ဝ မရွိခဲ့​​ဘဲ ၾကယ္တံခြန္မ်ား​​ ဝင္တိုက္ရာမွ ​​ေရမ်ား​​ ပ်ံ့​​ႏွံ့​​​ေရာက္ရွိလာသည္ဟူ​​ေသာ အယူအဆသစ္ကို ​​ေလ့​​လာစဉ္း​​စား​​​ေနၿပီျဖစ္သည္။

         ကမၻာေျမ၏ ဓာတုဖြဲ့​​စည္း​​ပံုအရ ဥကၠာခဲႏွင့္​​ ၾကယ္တံခြန္မ်ား​​တြင္ ပါဝင္​​ေန​​ေသာ Deuterium ဖြဲ့​​စည္း​​ပံုသည္ ပိုမိုလ်င္ျမန္စြာ အ​​ေျခက်တည္ရွိသြား​​နိုင္မည္ဟု သိရသည္။ သတၲုဆန္​​ေသာ ျဒပ္မ်ား​​ ပါဝင္​​ေသာ ပစၥည္း​​မ်ား​​သည္လည္း​​ ကမ႓ာ​​ေပၚသို့​​ ဥကၠာခဲမ်ား​​ က်​​ေရာက္ခ်ိန္တြင္ ပိုမိုပ်ံ့​​ႏွံ့​​တည္ရွိလာျခင္း​​ဟု ပညာရွင္မ်ား​​က ယံုၾကည္ထား​​သည္။


          Hartley 2သည္ Dueteriumတည္ရွိမႈဆိုင္ရာ ​​ေလ့​​လာဆန္း​​စစ္မႈမ်ား​​ကို က်ယ္က်ယ္ျပန့္​​ျပန့္​​ လုပ္​​ေဆာင္နိုင္ခဲ့​​သည့္​​ ပထမဆံုး​​ ၾကယ္တံခြန္လည္း​​ ျဖစ္လာ​​ေၾကာင္း​​ သိရွိရသည္။ အဆိုပါ ​​ေလ့​​လာမႈ စစ္တမ္း​​ကို အ​​ေမရိကန္နိုင္ငံ၊​ မစ္ခ်ီဂန္ တကၠသိုလ္မွ သု​​ေတသန ပညာရွင္ တက္ဘာဂ်င္က ဦး​​​ေဆာင္ခဲ့​​ျခင္း​​ဟုလည္း​​ Natureက ​​ေဖာ္ျပသြား​​သည္။

'Ocean-like' ice in space scan shows that Earth's life-giving oceans might have ridden in on a comet's tail

Today, most of Earth's surface is covered in water - but scientists believe Earth's oceans didn't form until around eight million years after the planet itself.
The discovery of 'ocean-like' water on a comet by the HiFi instrument on the Herschel Space Observatory hints that Earth's oceans might have arrived in the form of comet ice.
If so, the impacts (we'd have needed quite a few) would have formed an important stage in the evolution of life on Earth.
Detection of 'ocean-like' water in a comet supports the theory that comets delivered a significant portion of Earth's oceans, which scientists believe formed about 8 million years after the planet itself
Detection of 'ocean-like' water in a comet supports the theory that comets delivered a significant portion of Earth's oceans, which scientists believe formed about 8 million years after the planet itself

'Life would not exist on Earth without liquid water, and so the questions of how and when the oceans got here is a fundamental one,' said University of Massachussetts astronomy professor Ted Bergin, 'It's a big puzzle and these new findings are an important piece.'
Previous scans of comets led astronomers to believe that the icy bodies could not have brought water to Earth - or at least were only responsible for a very small fraction of it.

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HiFi, the Heterodyne Instrument for the Infrared on the Hershel Space Observatory, detected a familiiar, 'ocean-like' composition to the  water on the comet Hartley 2 - a comet that had been 'visited' at a distance of 700km by NASA's Deep Impact spacecraft.
By ocean-like, of course, the astronomers don't mean that it is green and swimming with fish.
Could water - the building block of life - have arrived on Earth on the tails of a comet?
Could water - the building block of life - have arrived on Earth on the tails of a comet?

Hartley-2 is frozen solid in the cold of deep space - the comet is composed of chunks of water ice and frozen carbon dioxide.
Using measurements from the infrared telescope, the researchers found that the ice on a comet called Hartley 2 has similar chemical compositions to our oceans - judging by the mix of 'normal' hydrogen atoms and deuterium atoms, one of the chemical isotopes found in heavy water.
It is the first time ocean-like water has been detected in a comet. Bergin admits, 'We were all surprised.'
Hartley-2 was observed 'up close' by NASA's Deep Impact spacecraft - but the new scans reveals the comet's water is more 'ocean-like' than previously thought
Hartley-2 was observed 'up close' by NASA's Deep Impact spacecraft - but the new scans reveals the comet's water is more 'ocean-like' than previously thought

HiFi has previously scanned six other comets - but none had 'Earth-like' water. The astronomers hypothesised that Hartley-2 formed nearer Earth than the other six - in our solar system's Kuiper belt, and the 'different' asteroids formed 5,000 times further away, in the distant Oort Cloud.
The scans of other comets led astronomers to speculate that comets could not have been the source of Earth's water.
The source of earth's oceans has been a subject for debate among astronomers for decades - and there are various competing theories, from chemical processes in the cooling Earth to asteroid impacts. Now, though, it seems comets might have brought the life-giving substance to Earth - in just the right mixture for early life to thrive.

 




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28/10/12 4:37 PM  

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