A delay will keep SpaceX's Falcon 9 rocket on the launch pad for a few more days.
NASA said the launch to the International Space Station, which was scheduled for Tuesday, is being pushed back to Friday.
NASA said the re-scheduling is designed to give SpaceX extra time to make sure they have a successful launch.
The window for the launch is set to open at 1:20 p.m. Friday. The rocket is launching from Space Launch Complex 40 at Cape Canaveral Air Force Station.
The Falcon 9 rocket will carry a Dragon capsule packed with scientific equipment to the ISS. If the launch goes well, the rocket capsule will arrive at the ISS on Sunday.