raw research from the Gaia - ESO project has give away that theMilky Way in all likelihood formed in the eye of the galaxy first , with the outer regions forming more slowly . This groundbreaking survey was direct by Maria Bergemann of the University of Cambridge and has been submitted to the journalAstronomy and Astrophysics .
The Gaia - ESO surveyseeks to well understandhow the Milky Way galaxyformed an estimated 13.6 billion twelvemonth ago . As some of the earliest globular clusters begin to meld , the unfold galaxy began to take on a spherical anatomy . This is known as the stellar halo . As it continued to hit mass , the halo set out to birl and the angular momentum caused a disk to form around it . Our sunshine and many other young star were formed in this disc . finally , the galaxy flatten out into the spiral Supreme Headquarters Allied Powers Europe we fuck today .
When the first lead set about to appear in the Universe , they were composed almost solely of atomic number 1 and helium , as nothing else was readily available . “ Metallicity ” is the term used to line the amount of element see in a star that are n’t hydrogen or helium . Other elements , which the team refers to as “ contaminant alloy ” would be created later as ace forge heavy element in their center and then be sick them out as they tumble into supernovae . Core - prostration supernovae , which come from monolithic , short - live adept , develop a great deal of magnesium that is plan outwards and could go on to form new hotshot .
During its view , the Gaia - ESO team found that the stars with the largest immersion of magnesium are actually detect toward the mall of the galaxy , suggesting that monumental stars were take shape and dying early on in the galaxy ’s history . Even unseasoned virtuoso with high metallicity that were form out in the disk do n’t have much atomic number 12 , relatively speaking . This indicated to the research worker that stars that came from the disk took longer to spring than the stars in the center . Thus , the Milky Way formed from the interior out .
The study also bring new sixth sense to the debate that Milky Way ’s disk has adual structure : a thin disk composed of the untried element of the galaxy , and a thick disk composed of old , low metallicity stars . While the team did find that Modern stars indeed had much high metallicity overall than older stars , they did not find any evidence that the stars were segregated into thin or thick regions by age or alloy content .
