NGC 3603, a hot young star cluster in the Milky Way. massive newborn stars. The massive stars in the center of the cluster triggered the formation of younger stars in the halo, which can be seen as red dots. The dust at the center of the cluster is very hot, producing copious amounts of infrared light, which results in the bright, yellow cores of the nebulosity. The cluster contains some of the most massive stars known. Winds and radiation from the stars are evaporating and dispersing the cloud