Solar System showdown.
Hand
Eric
E
D018480:Astronauts / Q000191:economics / Q000639:trends; D018538:Jupiter; D018535:Mars; D013026:Space Flight / Q000191:economics / Q000639:trends*; D014481:United States; D018557:United States National Aeronautics and Space Administration / Q000191:economics / Q000639:trends*