Deke Slayton of Sparta, Wisconsin was one of the original 7 astronauts in this "planetary" group
[DOC] [TLE] Deke Slayton - WikiVisually [PAR] The Deke Slayton Memorial Space & Bicycle Museum in Sparta, Wisconsin, .... 
NASA Astronaut Group 1, "The Mercury Seven", "The Original Seven" 1959 ...... 
the largest among planetary satellites relative to the size of the planet that it orbits
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