An unpiloted SpaceX cargo Dragon spacecraft automatically docked to the space-facing port of the Harmony module at the International Space Station June 5, delivering some three-and-a-half tons of supplies, scientific experiments and a pair of new station solar arrays to the outpost. The new arrays – called ISS Roll Up Solar Arrays, or IROSAs – are the first of three pairs of solar wings that will be attached to the port and starboard trusses of the lab to augment the station’s power output. Two spacewalks are scheduled in June to attach the first pair of arrays that were flown to the station on the Dragon vehicle.