What common tool found on Earth is used by astronomers to study black holes?
A hinged joint Sextant A telescope A stethoscope A pair of binoculars VOCs and NOx A black hole experiments
A B C D E F G H
What common tool found on Earth is used by astronomers to study black holes? (A) A hinged joint (B) Sextant (C) A telescope (D) A stethoscope (E) A pair of binoculars (F) VOCs and NOx (G) A black hole (H) experiments