XL will stay at the Gateway for 6 to 12 months at a time, when research payloads inside and outside the cargo vessel could be operated remotely, even when crews are not present. Its payload capacity is expected to be more than to lunar orbit. There is no requirement for a return to Earth. At the end of the mission the Dragon XL must be able to undock and dispose of the same mass it can bring to the Gateway, by moving the spacecraft to a heliocentric orbit. See also Comparison of space station cargo vehicles List of human spaceflight programs Space Shuttle successors References Dragon Cargo spacecraft Dragon Vehicles introduced in 2010 Commercial spaceflight Reusable spacecraft