SpaceX's plan for in-orbit Starship refueling: a second Starship

During an update on the SpaceX Starship program, Elon Musk just showed off a brief clip that explained part of the plan for using these vehicles to reach Mars. It involved a Starship in orbit around Earth, meeting a similarly-sized vehicle to refuel…
Source: Engadget | SpaceX's plan for in-orbit Starship refueling: a second Starship