The extended white nebula in the center right of the image is a region of the cloud which is glowing in infrared light due to the heating of dust by bright young stars near the right edge of the cloud. Fainter multi-hued diffuse emission fills the image. The color of the nebulosity depends on the temperature, composition and size of the dust grains. Newborn stars peek out from the Rho Ophiuchi star-forming region in this dynamic image from NASA's Spitzer Space Telescope. This representative-color image of Rho Oph's main cloud, Lynds 1688, was created with data from Spitzer's infrared array camera, which has the highest spatial resolution of Spitzer's three imaging instruments, and its multiband imaging photometer, best for detecting cooler materials. Blue represents light with a wavelength of 3.6 microns; green shows light of 8 microns; and red is 24-micron light.
(Source: NASA Spitzer Space Telescope/JPL/Harvard-Smithsonian)