These great hollow globes of artificial super-metals, and artificial transparent adamant, ranged in size from the earliest and smallest structures, which were no bigger than a very small asteroid, to spheres considerably larger than the Earth. (Olaf Stapledon, STAR MAKER)
Sunday, September 22, 2013
A view from the Chandra X-Ray Observatory showing the x-ray sky. Data from the observatory led to the discovery of "volatile" black holes that can generate as much energy (in the x-ray wavelengths) as a million stars.