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သတင္းစံုေပ်ာ္၀င္အိုးၾကီးတြင္ ေဖာ္ျပထားသည့္ သတင္း၊ဓာတ္ပံုမ်ားသည္ သက္ဆိုင္သူမ်ား၏မူပိုင္သာျဖစ္ေၾကာင္း အသိေပးအပ္ပါသည္။

Wednesday, February 12, 2014

သက္တမ္းအရင့္ဆံုး ေရွးေဟာင္းၾကယ္ ၾသစေၾတးလ် သိပံၸပညာရွင္မ်ားေတြ႔ရိွ

The star discovered with the SkyMapper telescope at the Siding Spring observatory near Coonabarabran. Photograph: Space Telescope Science Institute/AAP
ကင္ဘာရာ၊ ေဖေဖာ္၀ါရီ-၁၀

ျဖစ္တည္မႈ သက္တမ္းႏွစ္ေပါင္း ၁၃ ဒသမ ၆ ဘီလီယံရွိၿပီျဖစ္သည့္ ၾကယ္ၿဂိဳဟ္ႀကီး တစ္စင္းကို ၾသစေၾတးလ်သိပံၸပညာရွင္မ်ားက ရွာေဖြေတြ႕ရွိထားရာ လက္ရွိအခ်ိန္ထိ ေထာက္လွမ္းေတြ႕ရွိၿပီးသမွ်
ေရွးေဟာင္းၾကယ္ၿဂိဳဟ္ႀကီးမ်ား အနက္သက္တမ္းအရင့္ဆံုးၾကယ္
ၿဂိဳဟ္ျဖစ္ေၾကာင္း ေဖေဖာ္၀ါရီ ၉ ရက္ သတင္းမ်ားတြင္ေဖာ္ျပသည္။

စၾက၀ဠာႀကီးကို စတင္ဖန္တီးေပးခဲ့ေသာ မဟာေပါက္ကဲြမႈျဖစ္စဥ္
(Big Bang)ေပၚေပါက္ၿပီးေနာက္ ပိုင္းႏွစ္ သန္းေပါင္းမ်ားစြာအၾကာတြင္ ယင္းၾကယ္ ၿဂိဳဟ္ႀကီးစတင္ျဖစ္တည္ခဲ့ျခင္းျဖစ္ေၾကာင္း ၾသစေၾတးလ်
သိပံၸပညာရွင္မ်ားက ယံုၾကည္ထားသည္။

ၾသစေၾတးလ်သိပံၸပညာရွင္မ်ား ရွာေဖြေတြ႕ရွိခဲ့ေသာ သက္တမ္းအရင့္ဆံုး ၾကယ္ၿဂိဳဟ္ႀကီးသည္ေနစၾက၀ဠာ အဖဲြ႕အစည္းတည္ရွိရာ နဂါးေငြ႕တန္း ၾကယ္စုအတြင္းမွာပင္တည္ရွိၿပီး ကမၻာေျမႏွင့္ အလင္းႏွစ္ ၆၀၀၀
ကြာေ၀းေၾကာင္း သတင္းမ်ားတြင္ ေဖာ္ျပထားသည္။

အဆိုပါ ၾကယ္ၿဂိဳဟ္ႀကီးသည္ စၾက၀ဠာ၏အတိုင္းအဆအရ
ကမၻာေျမႏွင့္အေတာ္အသင့္နီးသည့္ အကြာအေ၀းတြင္ရွိေနေၾကာင္း ၾသစေၾတးလ်အမ်ဳိးသား တကၠသိုလ္မွ နကၡတၱေဗဒသိပံၸပညာရွင္တစ္ဦးက ေျပာၾကားသည္။

၂၀၀၇ ခုႏွစ္ႏွင့္ ၂၀၁၃ ခုႏွစ္မ်ား အတြင္း ဥေရာပႏွင့္ အေမရိကန္
နကၡတၱေဗဒသိပံၸပညာရွင္မ်ား သီးျခားစီ ရွာေဖြ ေတြ႕ရွိခဲ့ေသာ
ေရွးေဟာင္းၾကယ္ႀကီးႏွစ္စင္းမွာသက္တမ္းအားျဖင့္ ႏွစ္ေပါင္း ၁၃ ဒသမ
၂ သန္း၀န္းက်င္တြင္ရွိရာ ျဖစ္တည္မႈ သက္တမ္းအရင့္ဆံုးၾကယ္ၿဂိဳဟ္ႀကီး
မ်ားအျဖစ္ စာရင္းေပါက္ခဲ့ဖူးသည္။
စံေတာ္ခ်ိန္ ေန႔စဥ္သတင္းစာ

Australian scientists discover oldest known star

A team of Australian astronomers say they have identified the oldest known star in our universe -- one that formed a mere 200 million years after the Big Bang.
"This is the first time that we've been able to unambiguously say that we've found the chemical fingerprint of a first star," lead researcher, Stefan Keller of the Australian National University (ANU) research school of astronomy and astrophysics said in a press release.
The star, named SMSS J031300.36-670839.3, is estimated to be 13.6 billion years old and is much older than previous stars found in 2007 and 2013, which were believed to be 13.2 billion years old.
The astronomers analyzed the light from the star to determine its chemical makeup, and extrapolated its age from there.
"The telltale sign that the star is so ancient is the complete absence of any detectable level of iron in the spectrum of light emerging from the star," explained Keller.
The star was first spotted on January 2 in the Milky Way, 6,000 light years away from the Earth using the ANU Skymapper telescope.
"The stars we are finding number one in a million," team member Professor Mike Bessel said in a press release. "Finding such needles in a haystack is possible thanks to the ANU SkyMapper telescope that is unique in its ability to find stars with low iron from their color."
The newly discovered star was formed in the wake of a primordial star and had a mass 60 times that of our Sun.
"To make a star like our Sun, you take the basic ingredients of hydrogen and helium from the Big Bang and add an enormous amount of iron – the equivalent of about 1,000 times the Earth's mass," Keller said.
Keller explained that primordial stars were previously thought to have died in violent explosions which polluted space with iron. But his discovery shows signs of pollution of lighter elements like carbon and magnesium with no traces of iron.
"To make this ancient star, you need no more than an Australia-sized asteroid of iron and lots of carbon," Keller continued. "It's a very different recipe that tells us a lot about the nature of the first stars and how they died."
Keller and his team hope that their discovery will help resolve long-standing discrepancies between observations and predictions of the Big Bang.
"This is one of the first steps in understanding what those first stars were like," said Keller. "What this star has enabled us to do is record the fingerprint of those first stars."
The discovery was published in the latest edition of the journal Nature

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