ISS News Trick or Treat On Orbit By Keith Cowing NASA Watch October 31, 2010 Filed under ISS NASA astronaut Shannon Walker, Expedition 25 flight engineer, is pictured with a bag of candy floating freely in the Unity node of the International Space Station. high res (1.4 M) low res (95 K) Keith Cowing NASA Watch founder, Explorers Club Fellow, ex-NASA, Away Teams, Journalist, Space & Astrobiology, Lapsed climber.