question: What can knowledge of the stars be used for?
choices.text: travel art as a base safety story telling light source vision life
choices.label: A B C D E F G H
fact2: Navigation is a key element of space travel.
combinedfact: Knowledge of the stars can be used to travel.
formatted_question: What can knowledge of the stars be used for? (A) travel (B) art (C) as a base (D) safety (E) story telling (F) light source (G) vision (H) life