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)
Wednesday, May 20, 2015
Today's Astronomy Picture of the Day is a view from the ESA's Rosetta orbiter, busily exploring Comet 67P/Churyumov-Gerasimenko. Is that a cliff looming in the distance? Where is the sleeping lander Philae?