● The nearest black holes would be dozens of light years away from Earth.One light year is about 6 trillion(万亿)miles.Even the most powerful telescopes could not pick out an object so small at such a great distance.

　　In 1994 the Hubble Space Telescope provided evidence that black holes exist.There are still answers to be found,however,so black holes remain one of the mysteries of the universe.

　　16.Black holes are part of space.

　　A.Right　　B.Wrong　　C.Not mentioned

　　17.Black holes exist but are difficult to observe.

　　A.Right　　B.Wrong　　C.Not mentioned

　　18.The center of a black hole is empty.

　　A.Right　　B.Wrong　　C.Not mentioned

　　19.The attraction of two large stars leads to gravity.

　　A.Right　　B.Wrong　　C.Not mentioned

　　20.The sun is the heaviest star in the universe.

　　A.Right　　B.Wrong　　C.Not mentioned

　　21.The nearest black holes are hundreds of light years away from us.

　　A.Right　　B.Wrong　　C.Not mentioned

　　22.The Hubble Space Telescope helps scientists to understand the nature of the universe.

　　A.Right　　B.Wrong　　C.Not mentioned

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