A SpaceX Dragon cargo craft successfully launched on a resupply mission to the International Space Station Sunday from Cape Canaveral, Fla. The Dragon — packed with Christmas treats and presents — is expected to reach the space station on Monday, joining the Dragon that delivered four astronauts last month. With NASA’s commercial crew program officially underway, SpaceX expects to always have at least one Dragon capsule at the space station. This is SpaceX’s 21st station supply run for NASA since 2012. The flight was delayed a day by rough weather in the booster-recovery area offshore.