NASA will try later today to launch the space shuttle Discovery after fixing a fuel leak.They tried launching it Wednesday when a hydrogen leak came from the shuttle’s fuel tank. Technicians were not able to find the cause but say the problem appears to have been fixed. Launch director Mike Leinbach said:” You know again froma a launch safety and crew safety perspective we are fine. I’ll tell you it is a little unusual without having a root cause though, but the plan we have in place is perfectly fine, i really feel good about it” Once in space the Discovery crew will install the fourth and final solar power module for the US part of the international space station. If Discovery does not blast off today NASA will have to wait until April 7th before they can try again.