Top photo below, the Tarantula Nebula, in the Large Magellanic Cloud.
(M. Schirmer, T. Erben, M. Lombardi (IAEF Bonn), European Southern Observatory, apod020613)
Lower photo below, R136, a supercluster in the Tarantula Nebula, which is primarily responsible for lighting up the Nebula. R136 consists of dozens of supermassive (50 to 80 solar mass) extremely hot (spectral type O3) stars, formed within the last million or two years, and embedded within an extremely rich, massive open cluster, with perhaps half a million solar masses. (NASA, ESA, & F. Paresce (INAF-IASF), R. O'Connell (U. Virginia), & the HST WFC3 Science Oversight Committee, apod091221)