of this SF sub-genre. References External links Lucifer's Hammer at Worlds Without End Lucifer's Hammer sample chapters from Baen Books (the Hot Fudge Sundae scene is in "April: One") American science fiction novels 1977 American novels 1977 science fiction novels American post-apocalyptic novels Fiction about comets Collaborative novels Novels by Larry Niven Novels by Jerry Pournelle Novels about impact events Playboy Press books