Heavy Planet

ACKNOWLEDGMENTS

Mission of Gravity was first published in Astounding Science Fiction, April-July 1953. “Under” was first published in The Essential Hal Clement, Volume 3 (NESFA Press, 2000) and has appeared in Analog, January 2000. “Lecture Demonstration” was first published in Astounding: John W. Campbell Memorial Anthology, edited by Harry Harrison (Random House, 1973). Star Light was first published in Analog, June — September 1970. At the author’s request, this novel follows the Ballantine paperback text as modified by the author and should be considered the definitive text of this novel. “Whirligig World” was first published in Astounding Science Fiction, June 1953.

All stories appear by permission of the author.