CAPE CANAVERAL, Fla. — SpaceX is back on the launch pad in hopes of making a critical delivery to the International Space Station.

Liftoff is scheduled for 3:25 p.m. Friday. But stormy weather may force another delay.

NASA’s commercial supplier was foiled by a leaky rocket valve during Monday’s launch attempt. 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.


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