be retrieved back to earth. The solar array unfurled June 18, extending by tensioning booms on both sides of the 1.6-meter-wide wing. NASA decided to conduct continuous tests for a week and observe its consequences. Engineers observed the behavior of the solar array as it was exposed to extreme temperature swings through the ISS's orbit. Vibrations and oscillations were also mechanically introduced to assess the array's response to structural loads. Subsequent to the experiments, ground controllers were unable to lock the solar panel in its stowed configuration. The solar array was therefore jettisoned from the International Space Station on June 30, following the 12-day test. iROSA 2B/4B In June 2021, two new solar iROSA panels were installed on the International Space Station's P6 truss mast cans. The two operations took six hours each to complete and were carried out on three spacewalks by astronauts Shane Kimbrough and Thomas Pesquet. The new arrays were intended to give the station a total of 120 kilowatts of additional augmented power during daytime orbit. iROSA 3A/4A In December 2022, Expedition 68 crew members Josh Cassada and Frank Rubio installed an iROSA at Array 3A on the S4 truss segment and connected it to the US power system. The spacewalkers undid bolts and installed cables and at 17:37 GMT the array was deployed and is receiving power. As part of get-ahead tasks, they prepared the 4A array on the P4 truss segment for the next spacewalk, demated the 1B array on the S6 segment, broke torque on the P4 electronics boxes, and installed cables along the truss to be mated at the end of the fifth spacewalk of the expedition. The spacewalk faced a delay when Cassada's suit did not power up. Troubleshooting steps were carried out and power was restored to Cassada's suit so they could continue the spacewalk. Nick Hague was ground support communicator for the spacewalk. On 22 December 2022, during Cassada and Rubio's next spacewalk, the other iROSA was installed on top of the old 4A solar array. Applications Over time, the photovoltaic cells on the ISS' existing Solar Array Wings on the Integrated Truss Structure have degraded gradually, having been designed for a 15-year service life. This is especially noticeable with the first arrays to launch, with the P6 and P4 Trusses in 2000 and 2006. To augment the wings, three pairs of scaled-up versions known as iROSA are planned