peek at solution solve puzzle
quality: difficulty: solvability: moderate lookahead?
Puzzle Description:
Xenon is used as a propellant for ion thrusters in spacecraft. It was used in the ion propulsion engines on NASA's Dawn Spacecraft and Europe's SMART-1.
#1: Sarah Andrews (sarah) on Jun 16, 2011
great design#2: Kristen Vognild (kristen) on Jun 19, 2011
I like this one, too. It's a chibi rocket!
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