A Crew Dragon spacecraft docked with the International Space Station on Valentine's Day, and astronauts popped open the hatches at 5:14 pm ET (22:14 UTC) on Saturday evening.
The arrival of four new astronauts as part of the Crew 12 mission—Jessica Meir and Jack Hathaway of NASA, Sophie Adenot of the European Space Agency, and Andrey Fedyaev of Roscosmos—brought the total number of crew on board the space station to seven, giving the US space agency a full complement in orbit.
The number of astronauts living on board the station fluctuates over time, depending on crew rotations and private astronauts making shorter stays, but since Crew Dragon began flying regularly at the end of 2020 NASA has sought to keep at least four "USOS" astronauts on board at all time. This stands for "US Orbital Segment," and means astronauts from the United States, Canada, Europe, and Japan who are trained to operate the areas of the station maintained by NASA and its partner astronauts.