The spacecraft will haul approximately 3,600 kilograms (4 tons) of material in a pressurized cargo module to the International Space Station in December 2015. This is the fourth Commercial Resupply Services cargo run by Orbital Sciences (OA-4). The Cygnus spacecraft is developed and produced by Orbital Sciences. Historically, it has always launched on an Orbital Antares rocket, but that rocket is still grounded for safety upgrades following the unscheduled rapid disassembly last fall. Instead, the Cygnus will be launched by a United Launch Alliance Atlas V rocket. It will also be launching from a new pad — Cape Canaveral instead...