 The first stars to form after the Big Bang may have been larger , up to 300 M ☉ , due to the complete absence of elements heavier than lithium in their composition . This generation of supermassive population III stars is likely to have existed in the very early universe ( i.e. , they are observed to have a high redshift ) , and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life . In June 2015 , astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6 @.@ 60 . 
 The first stars to form after the Big Bang may have been larger , up to 300 M ☉ , due to the complete absence of elements heavier than lithium in their composition . This generation of supermassive population III stars <a href='drop_aux' title='1'><mark>is</mark></a>likely to <a href='been_done' title='2'><mark>have</mark></a> existed in the very early universe ( i.e. , they are observed to have a high redshift ) , and may <a href='been_done' title='3'><mark>have</mark></a> started the production of chemical elements heavier than hydrogen <a href='null_relcl' title='4'><mark>that</mark></a>are needed for the later formation of planets and life . In June 2015 , astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6 @.@ 60 . 
The first stars to form after the Big Bang may have been larger , up to 300 M ☉ , due to da complete absence of elements heavier den lithium in their composition . dis generation of supermassive population III stars likely to done existed in tdavery early universe ( i.e. , they are observed to have a high redshift ) , and may done started the production of chemical elements heavier tdenhydrogen are needed fir the later formation of planets and life . In June 2015 , astronomers reported evidence for Population III stars in thdaosmos Redshift 7 galaxy at z = 6 @.@ 60 .