title: Choosing a world.
mesh_terms: D018559:Exobiology / Q000191:economics / Q000295:instrumentation / Q000639:trends*; D005118:Extraterrestrial Environment / Q000737:chemistry; D018538:Jupiter; D000069497:Origin of Life; D018539:Saturn; D013026:Space Flight / Q000191:economics / Q000295:instrumentation / Q000639:trends*