The rotating service structure has been retracted from the Ares I-X rocket to allow a full test of the rocket.

As the sun falls behind Launch Pad 39B at NASA's Kennedy Space Center in Florida, the rotating service structure, or RSS, has been retracted from the 327-foot-tall Ares I-X rocket to allow a full test of the rocket to be conducted.

The transfer of the pad from the Space Shuttle Program to the Constellation Program took place May 31. Modifications made to the pad include the removal of shuttle unique subsystems, such as the orbiter access arm and a section of the gaseous oxygen vent arm, along with the installation of three 600-foot lightning towers, access platforms, environmental control systems and a vehicle stabilization system. Part of the Constellation Program, the Ares I-X is the test vehicle for the Ares I. The Ares I-X flight test is targeted for Oct. 27. For information on the Ares I-X vehicle and flight test, visit http://www.nasa.gov/aresIX. Photo credit: NASA/Jack Pfaller