Northrop Grumman’s uncrewed Cygnus spacecraft departed the International Space Station on Saturday, more than three months after delivering nearly 8,000 pounds of supplies, scientific investigations, commercial products, hardware, and other cargo to the orbiting laboratory. Flight controllers on the ground commanded the space station’s Canadarm2 robotic arm to detach Cygnus from the Unity module’s Earth-facing port. The arm then maneuvered the spacecraft into position and released it at 11:01 a.m. ET. Astronaut Matthias Maurer of ESA (European Space Agency) monitored Cygnus’s systems upon its departure from the space station. After departure, the Kentucky Re-Entry Probe Experiment (KREPE) stowed inside Cygnus took measurements to demonstrate a thermal protection system for spacecraft and their contents during re-entry in Earth’s atmosphere, which can be difficult to replicate in ground simulations. Cygnus will de-orbit on Wednesday, Dec. 15, following a de-orbit engine firing to set up a destructive re-entry in which the spacecraft, filled …