Credit: NASA/JPL-Caltech/A. Kashlinsky (Goddard Space Flight Center)

This is an image from NASA's Spitzer Space Telescope of a region of sky in the constellation Draco, covering about 50 by 100 million light-years (6 to 12 arcminutes). In this image all the stars, galaxies and artifacts were masked out. The remaining background reveals a glow that is not attributed to galaxies or stars. This might be the glow of the first stars in the universe.

This pseudocolor image comes from infrared data at a wavelength of 3.6 microns, below what the human eye can detect.