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compass rose The Great Celestial Stencil
Cover your entire ceiling with an accurate glowing scene.  Also available as a luminous poster.
Demonstration engine Rocket in a box!
Demonstrate a real working rocket engine in your lab/school/museum/home/yurt!

 
Water rocket thumbnail The World's Best Water Rocket
Better performing yet simple and intrinsically safe.
Celestial Mechanics! Websites, like this one?
Then I can make one for you!