Age-metallicity relation of the Galaxy. Different stellar populations are shown. Filled areas, in order of increasing age: thin disc field stars, thick disc field stars and halo field stars. Frames in the same order: thin disc open clusters, bulge (red frame), thick disc globular clusters (green frame), young halo globular clusters and old halo globular clusters.
<a href="//commons.wikimedia.org/wiki/User:Vallastro" title="User:Vallastro">Vallastro</a>
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<span class="int-own-work" lang="en">Own work</span>