of monoliths increasing at a geometric rate. (The film accelerates the pace from the novel, both shortening Bowman's deadline from fifteen days, and making the spot grow faster.) Initially, it was planned to inject Discovery on an Earth-bound trajectory (though it would not arrive for some years); however, when faced with Bowman's warning, the Leonov crew devises a plan to use Discovery as a 'booster rocket', enabling them to return to Earth ahead of schedule, but leaving Discovery in an elliptical orbit of Jupiter. The crew worries that Hal will have the same neuroses on discovering that he will be abandoned, and Chandra convinces HAL that the human crew is in danger and must leave. After detaching itself from Discovery, Leonov makes a hasty exit from the Jupiter system, just in time to witness the Monoliths engulf Jupiter. Through a mechanism that the novel only partially explains, these monoliths increase Jupiter's density until the planet achieves nuclear fusion, becoming a small star. As Leonov leaves Jupiter, Bowman instructs HAL to repeatedly broadcast a message warning travellers not to land on Europa. The new star, which Earth eventually dubs "Lucifer", destroys Discovery. HAL is transformed into the same kind of entity as David Bowman and becomes Bowman's companion. Notes References Arthur C. Clarke The Lost Worlds of 2001, Signet, 1972 Clément, Gilles; Bukley, Angie; Paloski, William, "History of artificial gravity", ch. 3 in, Clément, Gilles; Bukley, Angie (eds), Artificial Gravity, Springer Science & Business Media, 2007 . Schwarm, Stephanie, The Making of 2001: a Space Odyssey, Modern Library, 2000 . Space Odyssey Fictional spacecraft