NICER’s night moves trace the X-ray sky

NASA/Goddard Space Flight Center In this image, numerous sweeping arcs seem to congregate at various bright regions. You may wonder: What is being shown? Air traffic routes? Information moving around…

Another satellite re-entry and burnup expected, this one may have been brought down by hackers

This is interesting. The ROSAT X-ray observatory is expected to burn up in about a week and it has quite a checkered and colorful history. According to Wikipedia, ROSAT was…