Space shuttle Discovery's final flight keeps getting delayed.
The mission is now off until the end of February. NASA had been aiming for an early February liftoff. But managers decided Thursday evening to take more time to complete repairs to Discovery's external fuel tank.
Following a failed launch attempt in November, cracks were found in metal struts on the massive tank. More cracks were found last week, after the shuttle was returned to its hangar. NASA is considering reinforcing all 108 of the struts for extra safety.
Discovery is loaded with supplies for the International Space Station. As of now, the mission is the next-to-last for NASA's 30-year shuttle program. Another flight, however, may be added this summer.