English: Image: This infrared image from NASA's Spitzer Space Telescope shows the Rosette nebula, a pretty star-forming region more than 5,000 light-years away in the constellation Monoceros. In optical light, the nebula looks like a rosebud, or the "rosette" adornments that date back to antiquity. But lurking inside this delicate cosmic rosebud are so-called planetary "danger zones" (see sphere illustrations). These zones surround super hot stars, called O-stars (blue stars inside spheres), which give off intense winds and radiation. Young, cooler stars that just happen to reside within one of these zones are in danger of having their dusty planet-forming materials stripped away.

English: A en:Spitzer Space Telescope (SIRTF) image of en:NGC 2244 Credit: SIRTF/en:NASA. http://www.nasa.gov/mission_pages/spitzer/multimedia/pia09267b.html