LIVE Coverage of the Rendezvous and Autonomous Docking of the SpaceX CRS-21 Dragon Cargo Craft to the International Space Station
Credit : NASA
Cargo includes several science experiments, and the external payload is the Nanoracks Bishop Airlock. Although the boosters for most Dragon 1 missions returned to LZ-1, the booster for this mission is expected to land on an ASDS. The mission will be complete with return and recovery of the Dragon capsule and down cargo.

Started at 10:45 a.m. EST, Sun., Dec. 6 as the 21st #SpaceX cargo resupply mission to the International Space Station lifts off from Launch Complex 39A at NASA's Kennedy Space Center. Launch is targeted at 11:17 a.m. The targeted date has changed due to poor weather conditions on Sat., Dec. 5 in the recovery area. This will be the first flight of the upgraded cargo version of the Dragon 2 spacecraft. On board are over 250 science investigations, as well as the Nanoracks Bishop Airlock, set to be attached to the station's Tranquility module. This first…