ISS Assembly Mission 3AArriving aboard space shuttle Discovery, the STS-92 crew installed the Z1-Truss. Inside the Z1 are four Control Moment Gyroscopes (CMGs) that provide the International Space Station's attitude control.Read More Facebook Pinterest X LinkedIn Email https://www.nasa.gov/image-detail/iss-assembly-mission-3a/Copy URL to clipboard> DownloadShareSize1041x1041px