As the sun sinks Space Shuttle Endeavour on Launch Pad 39A is silhouetted.

As the sun sinks in the west, Space Shuttle Endeavour on Launch Pad 39A is silhouetted. Only one solid rocket booster and external tank is visible with the Rotating Service Structure still in place. The 80-foot-tall fiberglass mast on top of the Fixed Service Structure points to the sky. Endeavour waits for mission STS-99, known as the Shuttle Radar Topography Mission (SRTM), which will chart a new course to produce unrivaled 3-D images of the Earth's surface. The result of the SRTM could be close to 1 trillion measurements of the Earth's topography. The mission is expected to last 11days, with Endeavour landing at KSC Tuesday, Feb. 22, at 4:36 p.m. EST. This is the 97th Shuttle flight and 14th for Shuttle Endeavour