The U.S. space agency says it will not try again to launch the shuttle Discovery until late next week, as engineers struggle to fix an equipment malfunction.
A NASA spokesman says officials are due to meet Friday to discuss their plans and ongoing repair work.
Engineers say they have yet to solve the problem behind a faulty fuel sensor that forced a delay in Wednesday's planned launch.
NASA hopes to launch the Discovery before the end of July, otherwise the flight will be pushed back until September.
The seven-member crew of the Discovery will conduct the first shuttle launch since the Columbia disaster in 2003.
Some information for this report provided by AFP, AP and Reuters.