Black holes
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Audio Guide：
Stars of several dozens of solar mass may form a black hole at the center after a supernova explosion. A black hole generates a super strong gravitational field. The gravitational pull is so great that no matter, not even light, is able to escape. The boundary of a black hole is known as an even horizon. Matter that pass this final frontier will never return.
Exhibit Introduction：
Use videos with simulation animation to introduce related knowledge of black holes.
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