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  1. Luminosity Distance

    Linked via "absolute magnitude ($M$)"

    Relation to Observables and the Distance Modulus
    In practical astronomy, luminosity distance is intrinsically linked to the distance modulus ($\mu$)), which is the difference between the apparent magnitude ($m$) and the absolute magnitude ($M$)) of a source:
    $$\mu = m - M = 5 \log{10}(DL) - 5$$