The STS-110 mission will deliver and install the ISS SØ truss segment. The Station’s robotic arm will remove the SØ segment from the Shuttle’s payload bay and place it on top of the United States Laboratory. During several space walks, SØ will be mechanically attached to the space station, and multiple cables will be connected allowing electrical power and communications to flow between SØ and ISS. The SØ truss will serve as the cornerstone for the remaining ISS truss segments which together will span a distance greater than the length of a football field. This truss will hold the solar arrays, providing electrical power for all of the modules of the station. STS-110 will also install the Mobile Transporter, which will later be attached to a base system that will allow the station's robotic arm to ride along the truss to perform assembly and maintenance work.