asked about the stars in the background, a crew spokesperson said they "...represent the thousands of space workers throughout the ISS partnership who have contributed to the successful construction of our International Space Station." Science activities Two science racks, known as EXPRESS Racks No. 1 and 2, were delivered to the station in April aboard STS-100. One of the experiments on EXPRESS Rack No. 2 was the Experiment of Physics of Colloids in Space. Several different colloid mixtures were studied, and the analysis is still underway. References NASA External links Expedition 2 Photography Expedition 02 2001 in spaceflight Dennis Tito