The Trifid Nebula is a giant star-forming cloud of gas and dust located 5,400 light-years away in the constellation Sagittarius. Where dark lanes of dust are visible trisecting the nebula in a visible-light picture, bright regions of star-forming activity are revealed in this false-color picture. The telescope uncovered 30 massive embryonic stars and 120 smaller newborn stars (visible in this image as yellow and red spots) throughout the Trifid Nebula, in both its dark lanes and luminous clouds. The embryos are thought to have been triggered by a massive "type O" star, which can be seen as a white spot at the center of the nebula. Type O stars are the most massive stars, ending their brief lives in explosive supernovas. The small newborn stars probably arose at the same time as the O star, and from the same original cloud of gas and dust. Ten of the 30 massive embryonic stars were found in four dark cores, or stellar "incubators," where stars are born.