NASA POSTPONED SHUTTLE LAUNCH

Again, NASA postponed its first space shuttle launch of the year for a fourth time on Friday which failed to resolve concerns about potential problem with fuel pressurization valves. The Shuttle discovery has been scheduled to lift off on February 27 for a 14-day flight to outfit the International Space Station with a final set of solar wings panels. The flight, has already been delayed three times due to safety reviews that involves three small valves in the shuttle's rear engine that are needed to keep the external fuel tank properly pressurized during the 8.5 minute climb into the orbit.

In its shuttle mission last November, a tiny piece of one valve has been cracked however, there was not danger to the shuttle or its crew, but the U.S. space agency wants to be sure of its safety and of different outcome.

______________________________