Orbit was an American long-running series of anthologies of new fiction edited by Damon Knight, often featuring work by such writers as Gene Wolfe, Joanna Russ, R. A. Lafferty, and Kate Wilhelm, who was married to Knight. The anthologies tended toward the avant-garde edge of science fiction, but by no means exclusively; occasionally the volumes would feature some nonfiction critical writing or humorous anecdotes by Knight. Inspired by Frederik Pohl's Star Science Fiction series, and in its turn an influence on Harlan Ellison's Dangerous Visions volumes and many others, it ran for over a decade and twenty-one volumes, not including a "Best-of" collection which covered the years 1966-1976.
Volume 1 was published in October 1966. Algis Budrys described it as an example of "a book that represents science fiction well, but not to any extraordinary extent."
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Volume 2 was published in 1967, and edited by Damon Knight. Budrys received it without enthusiasm, saying "It is more a sign that Damon's heart is in the right place than it is a really satisfactory book."
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Volume 3 was published in 1968, and edited by Damon Knight. Algis Budrys found the volume "happens to contain some remarkable work," although he faulted the jacket copy as overpromotional.
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Volume 4 was published in 1968, and edited by Damon Knight.
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Volume 5 was published September 1969 by G.P. Putnam's Sons. It was reprinted in October 1969 by Putnam, December 1969 by Berkley Medallion, and November 1970 in the UK by Rapp & Whiting. It was edited by Damon KnightBarry Malzberg wrote that the anthology "doesn't, somehow, seem to be at the same high level of ambition or accomplishment as the earlier volumes," but singled out "The Big Flash" for praise, declaring "The last pages of this story may be one of the strongest experiences available in modern American fiction."