Das Hintergrundfoto des Blogs stellt einen Ausschnitt des Orionnebels und Umgebung dar und war das Astronomy Picture of the day am 23.04.2016:
This colorful rendition of part of the constellation of Orion comes from red light emitted by hydrogen and sulfur (SII), and blue-green light emitted by oxygen (OIII). Hues on the featured image were then digitally reassigned to be indicative of their elemental origins.
 Pictured, Barnard's Loop, across the image bottom, appears to cradle interstellar constructs including the intricate Orion Nebula seen just right of center. The Flame Nebula can also be quickly located, but it takes a careful eye to identify the slight indentation of the dark Horsehead Nebula

The Planetary Habitability Laboratory @ UPR Arecibo ( or just PHL @ UPR Arecibo