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The globular clusters have the oldest stars and are, yet, metal-poor.
The disc contains the youngest stars and are metal-rich. How can the
oldest stars, which have had a much longer time to go super-nova and
mix their interiors with the medium in which they are immersed, be
less metallic?
And, it is observed that these older systems lack any considerable dustlanes or free gas,
implying few, if any, supernovae.