NASA SAYS SPACEX’S NEXT STARSHIP FLIGHT COULD TEST REFUELING TECH

Summary from the TLDR newsletter

SpaceX and NASA may be demonstrating orbital refueling technology on the next Starship test flight. NASA has yet to make a decision on when to start testing the capability. Cryogenic propellants must be kept at super-low temperatures or they turn into a gas and boil off. Rockets using these types of propellants typically need to complete their missions within hours - NASA wants to extend this lifetime to months and enable the transfer of the propellants from one vehicle to another.