mass-luminosity relation
... that the mass-luminosity relation, first derived by Arthur Eddington in 1924, helps astronomers find the distances to binary star systems?
... that the <b id="mwA_g"><a class="mw-redirect" href="./Mass-luminosity_relation" id="mwA_k" rel="mw:WikiLink" title="Mass-luminosity relation">mass-luminosity relation</a></b>, first derived by <a href="./Arthur_Eddington" id="mwA_o" rel="mw:WikiLink" title="Arthur Eddington">Arthur Eddington</a> in 1924, helps astronomers find the distances to <a class="mw-redirect" href="./Binary_system_(astronomy)" id="mwA_s" rel="mw:WikiLink" title="Binary system (astronomy)">binary star systems</a>?