NASA's Hubble Space Telescope took this images of the asteroid 1 Ceres. The bright spot that appears in the image is a mystery. It is brighter than its surroundings. Yet it is still very dark, reflecting only a small portion of the sunlight that shines on it.
NASA, ESA, J. Parker (Southwest Research Institute), P. Thomas (Cornell University), and L. McFadden (University of Maryland, College Park)
<a rel="nofollow" class="external free" href="http://hubblesite.org/newscenter/newsdesk/archive/releases/2005/27/text/">http://hubblesite.org/newscenter/newsdesk/archive/releases/2005/27/text/</a> (Cropped from original image)