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New study suggests some possible explanations for the curious alignment of globular clusters around our Milky Way. From Universe Today.
While many classification schemes are used, one breaks globular clusters into three groups: an old halo group which includes the oldest of the clusters, those in the disk and bulge of the galaxy which tend to have higher metallicity, and a younger population of halo clusters. The latter of these provides a bit of a problem since the galaxy should have settled into a disk by the time they formed, depriving them of the necessary materials to form in the first place. But a new study suggests a solution that’s not of this galaxy.
Much more at the original article linked above.
Last Edit: Sept 22, 2011 12:00:50 GMT -6 by patrickm