【单选题】根据以下材料,回答题 Black Holes (1) Black holes can be best described as a sort of vacuum, sucking up everything in space. Scientists have discovered that black holes come from an explosion of huge stars. Star...
A.
Is there proof that black holes really exist?
B.
What are different types of black holes?
C.
How are black holes formed?
D.
How were black holes named?
E.
What happens to the objects around a black hole?
F.
What are black holes made of ?