Changes

==Old Universe View==

==Old Universe View==

Those who believe in a universe millions or billions of years old also believe that Population I stars are younger, and that the less metallicity a star has, the older it is.  They believe globular clusters to be around 9 to 13 billion years in age and initially form as a loose collection of stars.  They think that as the cluster passes into "adolescence", the stars near the center of the cluster begin to collapse in towards each other.  This collapse, according to Old-Universe advocates, ends when the interaction of [[binary star|binary systems]] and prevents any further contraction, at this point the cluster is at what evolutionists call "middle age".  Over millions of years, these Old-Universe advocates believe that stars in the binary systems are ejected by gravitational disruption as the cluster passes through "old age".  Virtually all globular clusters are far along into what evolutionists call the "old age" portion of their evolution.  However a more recent study of 13 globular clusters suggests though that some of the clusters may actually be much younger then initially believed.  Old-Universe enthusiasts believe this is because three of the clusters were found to still have a large number of [[x-ray]] binaries, suggesting to them that not enough time has passed to eject many binary companions from the cluster.  If these new observations are adopted into the Old-Universe orthodoxy, this would challenge the current theories on the evolution of such clusters.<ref>http://www.astronomynow.com/Oldglobularclusterssurprisinglyyoung.html</ref>

n the cosmological model of a billions of years old universe, it is theorized that globular clusters are around 9 to 13 billion years in age and initially form as a loose collection of stars.  The current theory in this model suggests as the cluster passes into "adolescence", the stars near the center of the cluster begin to collapse in towards each other.  This collapse ends when the interaction of [[binary star|binary systems]] and prevents any further contraction, at this point the cluster is at what is referred to as "middle age".  Over millions of years, the stars in the binary systems are ejected by gravitational disruption as the cluster passes through "old age".  Virtually all globular clusters are theorized to be far along int the "old age" portion of their evolution.  However a more recent study of 13 globular clusters suggests though that some of the clusters may actually be much younger then initially believed.  From observations by the [[Chandra X-Ray Observatory]], three of the clusters were found to have a large number of [[x-ray]] binaries, suggesting to them that not enough time has passed to eject many binary companions from the cluster, if the current models are correct.  If these new observations are are confirmed, this would challenge the current theories on the evolution of such clusters within the old universe cosmology.<ref>http://www.astronomynow.com/Oldglobularclusterssurprisinglyyoung.html</ref>

[[Category: Astronomy]]

[[Category: Astronomy]]