The Shuttle Atlantis is going to try to lift off on Thursday after several mechanical delays.
Atlantis will carry carry the European Space Agency's science lab, called Columbus to the orbiting outpost. That will be the second science lab because the United States operates one there already. The largest lab of all, Japan's Kibo, will be carried up in sections starting next month. Forecasters say only bad weather could delay Thursday's scheduled launch. The weather is expected to be better on Friday, when officials say there is an 80 percent chance of liftoff.