《星云世界》（英语：The Realm of the Nebulae）是爱德文·哈勃创作的一本天文学普及著作，由其在耶鲁大学西利曼纪念讲座上的讲稿改写而来，1936年出版。[1]
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Tom Bezzi. Hubble Time. iUniverse. 2000: 93. ISBN 9780595142477. John terribly depressed, and asked Edwin about his belief. Edwin said, "The whole thing is so much bigger than I am, and I can't understand it, so I just trust myself to it, and forget about it." It was not his nature to speculate. Theories, in his opinion, were an appropriate cocktail conversation. He was essentially an observer, and as he said in The Realm of the Nebulae: "Not until the empirical resources are exhausted, need we pass on to the dreamy realms of speculation." Edwin never exhausted those empirical resources. "I am an observer, not a theoretical man," he attested, and a lightly spoken word in a lecture or in a letter showed that observation was his choice.
