JohnHoltz
  • Member for 4 years, 5 months
  • Last seen more than a month ago
  • Pennsylvania, United States
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Astronomy 6,619 rep 2 gold badges15 silver badges22 bronze badges
Space Exploration 1,094 rep 1 gold badge7 silver badges13 bronze badges
Engineering 402 rep 3 silver badges7 bronze badges
Physics 198 rep 1 silver badge6 bronze badges
Earth Science 166 rep 4 bronze badges

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