Station at a crossroads.
D018480:Astronauts / Q000639:trends; D007391:International Cooperation; D013026:Space Flight / Q000295:instrumentation* / Q000639:trends*; D018531:Spacecraft / Q000191:economics / Q000295:instrumentation / Q000592:standards; D014481:United States; D018557:United States National Aeronautics and Space Administration