The bright horizontal band is the plane of the Milky Way, with the center of the Galaxy located at the center of the picture.
Hotter material appears blue or white while the cooler material appears red.
The hazy, horizontal S-shaped feature that crosses the image is faint heat emitted by dust in the plane of the solar system. The Large Magellanic Cloud is the relatively isolated spot located below the plane, right of center. Black stripes are regions of the sky that were not scanned by the telescope in its first six months of operation.