Graphical representation of period-luminosity relation for Cepheids. Gpraph was created from data found at <a href="https://en.wikipedia.org/wiki/en:Classical_Cepheid_variable#Period-luminosity_relation" class="extiw" title="w:en:Classical Cepheid variable">English Wikipedia</a>
<a href="//commons.wikimedia.org/wiki/User:Vedran_V" title="User:Vedran V">Vedran V</a>
2014-02-08 00:42:53
<span class="int-own-work" lang="en">Own work</span>