CRS-11

Dragon's first reflight. The capsule, C106, had flown to the station on CRS-4 in 2014; after refurbishment it became the first commercial spacecraft to make a second visit to the ISS. Among the secondaries, NICER — an X-ray timing instrument mounted externally on the station — began a precision study of neutron-star interiors, and the BIRDS-1 constellation delivered the first national satellites of Bangladesh, Ghana, and Mongolia.