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Line 32: − − ==Old Universe View== − − In the cosmological model of a billions of years old universe it is theorized that clusters are initially formed when a large molecular cloud collapses due to nearby gravitational interactions or [[supernova]]. As the molecular cloud collapses, it will fragment into increasingly smaller parts; they think that some of these fragments of gas and material that eventually result [[stellar evolution|in the creation of new stars]]. Eventually, according to these theories, the hottest and most massive of these stars drive away the remaining gasses through their stellar winds and radiation and star formation ceases.<ref>http://adsabs.harvard.edu/abs/1991MNRAS.249...76B</ref> − − As an open cluster drifts through space, the individual stars of the loosely bound cluster slowly begin to drift away from the cluster due to gravitational interactions with the rest of the galaxy. After few hundred million years the cluster would lose most of the member stars, which become individual stars orbiting the core of a [[galaxy]], connected only by their similar orbits in a disassociated group.<ref>http://adsabs.harvard.edu/abs/1998PASP..110.1117D</ref>
→Old Universe View
If the cluster lies within a [[nebula|nebulous structure]] it's classification is appended with an 'n'. Under this classification method for example, the [[Pleiades]] is classified as '''I3rn''' (Strong concentration towards the center, richly populated with stars that have a wide range in brightness, with nebulous material present). <ref>http://adsabs.harvard.edu/cgi-bin/bib_query?1930LicOB.420..154T</ref>
If the cluster lies within a [[nebula|nebulous structure]] it's classification is appended with an 'n'. Under this classification method for example, the [[Pleiades]] is classified as '''I3rn''' (Strong concentration towards the center, richly populated with stars that have a wide range in brightness, with nebulous material present). <ref>http://adsabs.harvard.edu/cgi-bin/bib_query?1930LicOB.420..154T</ref>
[[Category:Astronomy]]
[[Category:Astronomy]]