SpaceX will try to launch again on Sunday at 9:38AM ET. The rocket is carrying a Dragon cargo capsule filled with nearly 5,500 pounds of supplies to the International Space Station. It’s SpaceX’s tenth cargo mission for NASA. SpaceX’s Dragon capsule is carrying up a number of critical science experiments and technologies to the station. The vehicle will deliver strains of the deadly superbug MRSA to the ISS, so that astronauts can study how the bacteria behaves in microgravity. Even a module called Raven will also be traveling to space inside the Dragon’s trunk to test out a new type of navigation system for space. The 39A pad has been dormant since 2011, after the launch of Apollo 11. In 2014, SpaceX signed a 20-year lease with NASA to move into this launch complex. Some modifications were made to support the SpaceX which runs on a form of kerosene and liquid oxygen.