Black holes exist but are difficult to observe.A．RightB．WrongC．Not mentioned

They are sure they have all the facts they need to ______ the existence of a black hole.A．

Black Holes Most scientists agree that black holes exist but are nearly impossible to loca

The nearest black holes are hundreds of light years away from us.A．RightB．WrongC．Not menti

共用题干Black Holes1 Black holes can be best

共用题干Black Holes1 Black holes can be best

共用题干Black Holes1 Black holes can be best