The launch of a Nasa mission to explore two giant asteroids has been pushed back to September.
The Dawn spacecraft was due to launch on Sunday from Cape Canaveral Air Force Station in Florida.
But US space agency managers decided to postpone the lift-off due to scheduling problems with another Nasa mission.
Officials felt the window for launching Dawn in July was too tight, and that it could affect preparations for the Mars-bound Phoenix spacecraft.
Phoenix will launch from the Cape in August on a mission to explore the Red Planet's northern polar region.