| http://www.w3.org/ns/prov#value | - The missions were simulated with specially developed add-ons in the freeware Orbiter space flight simulator, and most of the graphics are screen captures from Orbiter, though some are real photos from NASA. Intended for ages 10 to adult, the book includes an appendix with details for each page, including information on the add-ons used in Orbiter to create the images.
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