Polarization of starlight results from the many particles in space between us and the star, which makes the starlight look different than if you were much closer.  I am studying the polarization of the open star cluster, NGC 6530, in the constellation of Sagittarius, using the Johnson-Cousins UBVRI filters.  The Johnson-Cousins UBVRI filters allow me to look at the star at different wavelengths.  NGC 6530 is a rich open cluster, which is an emission nebula known as the Lagoon Nebula.  Specifically, I am going to use the UBVRI filters to obtain wavelength dependence of polarization data from the star cluster.  The filters are able to do this because each filter targets a specific wavelength, so the combination of all the filters creates a big picture of a wide spectrum of wavelengths dependent upon polarization.