question: what is used for observing stars by astronomers?
choices.text: A hinged joint crucial optical system electricity cloud cover in a science facility the sun stormy weather
choices.label: A B C D E F G H
formatted_question: what is used for observing stars by astronomers? (A) A hinged joint (B) crucial (C) optical system (D) electricity (E) cloud cover (F) in a science facility (G) the sun (H) stormy weather