Composite 'false-colour' infrared image of the starburst region NGC 3603. The central cluster is the densest concentration of massive stars known in the Milky Way. It hosts more than 50 hot O-type stars. The brightest star in the field is the red supergiant IRS4; it is located about 80 arcsec NE of the center. About 18 arcsec N of the center are the ring nebula and the bipolar outflows around the blue supergiant Sher25. The photo also shows three proplyd-like objects [2] that have been recently discovered; they are similar to those seen in Orion Nebula, but 20-30 times more extended. About 1 arcmin SSE of the central cluster are seen the brightest members of the deeply embedded proto cluster IRS9.