A long way to go.
D018480:Astronauts; D006801:Humans; D007391:International Cooperation; D012106:Research / Q000191:economics* / Q000639:trends*; D013026:Space Flight / Q000191:economics*; D018531:Spacecraft / Q000191:economics*; D014481:United States; D018557:United States National Aeronautics and Space Administration / Q000191:economics