Because the bulk of the polymer was nonconducting, the charge stayed where it was produced, and a stable image of the light source resulted. (newscientist.com)
The researchers analysed satellite images of lights at night as a proxy for economic growth. (businessinsider.com)
Related sites More information and images from HST Ground - based images of the light echo Light echoes around Supernova 1987A (sciencemag.org)