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

This is an image from NASA's Spitzer Space Telescope of stars and galaxies in the constellation Draco, covering about 50 by 100 million light-years (6 to 12 arcminutes).

This is an infrared image showing wavelengths of 3.6 microns, below what the human eye can detect.

The data was used to mask all the stars, galaxies and artifacts in this region of sky. The remaining data revealed a glow that is not attributed to galaxies or stars. This might be the glow of the first stars in the universe.