New York: Walker and Company 1977. First Edition. , 204 pages. 8vo. Black paper boards. Corners worn and bumped. The dust jacket is worn, creased, with multiple edge tears. Spine slanted. Redeeming feature? It is SIGNED by the author, the famous and prolific Isaac Asimov in a bold hand on the title page. Good / Good. Boards. 
The story of black holes written in the way only Asimov can do. We once met Mr. Asimov at Noreascon (a science fiction and fantasy convention) in Boston. A wonderful person, sitting for hours to sign books for his fans, including a very young version of yours truly who at the time could only afford a book club edition of Murder at the ABA. Every time I buy a copy of a signed Asimov book I remember that moment fondly. Enough rambling. Not a great copy of this book, but the man himself held it to sign. That is worthwhile on it's own.