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The age-velocity-dispersion relation (AVR) is the correlation between the age of stars and high velocity dispersion within the local Milky Way. These also have a relation with metallicity, thus, the age-velocity-metallicity relation (AVMR): lower metallicity is associated with older stars that formed before supernovae increased the metallicity of molecular clouds. Among the theorized sources of this higher peculiar velocity of old stars are interactions with spiral arms and/or giant molecular clouds.