宇宙飛行

1. Origins, structure, and basic meaning

• Structure: 宇宙飛行 (うちゅうひこう) is a compound noun for travel through space. In both examples it sets the scope of later content or planning.
• Basic usage: 宇宙飛行を題材にした本 makes spaceflight a book's subject; 長期の宇宙飛行を想定した施設 makes it a design assumption for training.

2. Common pitfalls and similar expressions

• Subject matter of a book and premise of training
  • Both sentences use 宇宙飛行を, but 題材にした assigns subject matter and 想定した assigns a planning premise. Neither construction asserts that the flight actually occurred.