CAPE CANAVERAL, Fla. -- A SpaceX commercial rocket blasted off from Cape Canaveral on schedule Friday afternoon and is heading to the International Space Station.
Liftoff occurred at 3:25 p.m. amid weather concerns. But conditions remained favorable.
NASA's commercial supplier was foiled by a leaky rocket valve during a launch attempt on Monday. The valve has been replaced.
The unmanned Dragon cargo ship contains 2 1/2 tons of station supplies, including material for urgent computer repairs.
A backup computer failed outside the space station last Friday. Astronauts will conduct a spacewalk to replace the computer in the next few days.
NASA says the material on the Dragon is desirable for the repair job, but not essential. Much-needed food is also aboard, along with a new spacesuit and spacesuit replacement parts.