VOA慢速英语 哈勃改变了我们对宇宙的概念

　　At Oxford, Hubble studied law. He was interested in British Common Law, because his family had come to America from England many years before. He spent three years at Oxford.

　　In nineteen thirteen, Hubble returned to the United States. He opened a law office in Louisville, Kentucky. After a short time, however, he decided he did not want to be a lawyer. He returned to the University of Chicago. There, once again, he studied astronomy.

　　VOICE ONE:

　　Hubble watched the night sky with instruments at the university's Yerkes Observatory. His research involved a major question astronomers could not answer: What are nebulae?

　　The astronomical term "nebulae", Hubble explained, had come down through the centuries. It was the name given to permanent, cloudy areas in the sky outside our solar system. Some astronomers thought nebulae were part of our Milky Way Galaxy. Others thought they were island universes farther away in space.

　　In his research paper, Hubble said the issue could be decided only by more powerful instruments. And those instruments had not yet been developed.

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