星空

1. Origins, structure, and basic meaning

• Structure: 星空(ほしぞら) is a noun for a night sky in which stars are visible or shining across the view.
• Basic usage: The scene spreading overhead appears in 美しい星空が広がる, while the viewed object appears in 星空を眺める.

2. Common pitfalls and similar expressions

• Stars and the whole sky
  • It does not name one star; it focuses on the entire view of a sky filled with visible stars.
• Subject and object
  • Use 星空が when the sky spreads before the viewer and 星空を when someone gazes at it.