title: Fed up of Earth? Try Mars.
mesh_terms: D018480:Astronauts / Q000331:legislation & jurisprudence*; D018534:Earth, Planet; D063426:Human Migration; D018535:Mars; D011057:Politics; D012922:Social Change; D013026:Space Flight / Q000191:economics / Q000295:instrumentation / Q000639:trends*; D014481:United States; D018557:United States National Aeronautics and Space Administration