SpaceX clears Falcon 9 rocket for Tuesday morning launch

Its first launch attempt was cut short less than a second before liftoff on Saturday morning, but private space transportation company SpaceX will be trying once again to send its Dragon capsule to the International Space Station early tomorrow morning.

Saturday's launch was scrubbed when an onboard computer detected what SpaceX CEO Elon Musk described as "slightly high combustion chamber pressure" in one of the Falcon 9 rocket's nine engines, all of which are needed to lift the unmanned Dragon capsule into orbit. The problem was later traced to a valve in engine five, which has since been replaced.

If all goes well, the rocket will lift off tomorrow morning from Cape Canaveral at 3:44 a.m. EDT (12:44 a.m. PDT). If the launch is successful, and the Dragon capsule can dock with the ISS, it will mark a major milestone in the new age of space transport.