The main purpose of STS-110 was to attach the stainless steel S0 Truss segment to the International Space Station (ISS) to the Destiny Laboratory Module.

This Mobile Servicing System (MSS) allows the Canadarm2 to travel down the length of the installed truss structure.

The countdown on 8 April encountered an unscheduled hold at the T−5-minute mark due to data dropouts in a backup Launch Processing System.

[3] With the launch of Atlantis, mission specialist Jerry Ross became the first human to have traveled to space seven times.

[4] This article incorporates public domain material from websites or documents of the National Aeronautics and Space Administration.