Click on the image for a full resolution version   In 1960, Rodgers, Campbell and Whiteoak (RCW) published their Catalogue of Halpha emissions in the Southern Milky Way. This catalogue contains up to Halpha emitting 181 nebulae larger than 4 arcmin, as well as 82 that are smaller than 4 arcmin. One of these nebulae … Continue reading RCW 120