Retrieving "K Band" from the archives

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1. Mass To Light Ratio

   Linked via "$K$-band"

   The Mass-to-Light Ratio ($\Upsilon$) is an astronomical diagnostic parameter defined as the ratio of the total mass ($M$) enclosed within a specific volume (often a galaxy or galaxy cluster) to the total luminosity ($L$) emitted by that same volume across a specified bandpass, typically the optical $B$-band or the near-infrared $K$-band. Mathematically, it is expressed as:
   $$\Upsilon = \frac{M}{L}$$