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Astronomers may have just receive the remnants of some of the existence ’s very first asterisk . The chemical signatures of these far-off , 13 - plus - billion - yr - old aim are signally different from those of younger stars , like our sun . By study them , scientists go for to shed light on how star , galaxies and even canonic element form .
The inquiry , co - author by University of Florence astrophysicistStefania Salvadori , was published May 3 inThe Astrophysical Journal .
This artist’s impression shows a distant gas cloud that contains different chemical elements, illustrated here with schematic representations of various atoms.
In the earliest days of the cosmos , only very unsubdivided elements such as hydrogen and He were available . The first stars combust from these element alone . Over time , their white - spicy core step by step misrepresent simple atoms into overweight elements , such as carbon , oxygen , magnesium and eventually metal . Later generations of stars formed from clouds of gas containing these heavier atoms , and today most of the stars scientists observe are ample in metal like branding iron . ( Our sun is about 98 % H and helium , but contains touch total of heavier elements like iron , Ne and carbon . )
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Nobody has respect the original alloy - deficient stars directly ; most of them probably fizzled out or exploded long ago . But scientists can still observe some of their dusty remain by setting their sights billions of swooning class by .
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Using the European Southern Observatory ’s Very Large Telescope ( VLT ) , Salvadori and her team peer into three distant clouds of superstar - mold gas . On their own , these clouds would n’t tell scientists very much , but incoming light from nearbyquasars — passing promising astronomical burden formed by rubble falling into a supermassive sinister hole — helped reveal the cloud ’s enigma . Based on which wavelengths of light the gas cloud absorbed , the team determined what constituent the stellar remains were made of .
Sure enough , the clouds were extremely inadequate in iron and other metal elements , but plenteous in carbon copy , O and magnesium — precisely what would have been result over after the first sensation ran out of fuel and exploded , accord to the researcher . This tracks with other enquiry into the origins of maven , and may facilitate explain the composition of younger stars , including those find in theMilky Way .
" Our find open new avenues to indirectly study the nature of the first principal , full complementing studies of stars in our galaxy , " Salvadori said in astatement .
