described as a very large ship that could be handled by only two astronauts (David Bowman and Frank Poole), working 12 hour alternating shifts, along with the HAL 9000. In the book, IBM predicted that computer development would be advanced to such an extent that the mission could be undertaken with all the astronauts placed in hibernation. It was said to be desired, however, that regular communications be maintained throughout the voyage between the pilot and copilot and mission control back on Earth. During communication, an account is taken of the elapsed time for electromagnetic waves crossing space between the spaceship and the Earth. For example, Poole is depicted watching a pre-recorded birthday message from his family, rather than interacting with them in real-time. Such a conversation is not possible because messages take anywhere from 30 to 52 minutes to transmit between Jupiter and Earth. Naturally, this time would depend on the relative positions of the bodies in the Solar System at any given moment. The fate of Discovery After the malfunction of HAL, Bowman deactivated the computer, thus effectively isolating himself on Discovery. In the movie, when the spacecraft arrives at Jupiter, it encounters TMA-1's considerably larger 'Big Brother', 'TMA-2', at the Jupiter/Io L1 point. The novel is basically the same with Discovery in orbit around Saturn's moon Iapetus instead. In both versions, Bowman leaves Discovery to examine the monolith and is taken inside it. The novel and movie 2010: Odyssey Two follows the 2001: A Space Odyssey movie ending rather than the novel. After finding out that Discoverys orbit is failing, a joint Soviet-US mission (including Heywood Floyd) travels to Jupiter aboard the spacecraft Alexei Leonov to intercept and board Discovery believing that it harbours many of the answers to the mysteries surrounding the 2001 mission. Leonov docks with Discovery, reactivates the on-board systems, and stabilizes its orbit. Hal's creator, Dr. Chandra, is sent to reactivate the HAL 9000 computer and gather any data he can regarding the previous mission. Later on, an apparition of Dave Bowman appears, warning Floyd that Leonov must leave Jupiter within two days. Floyd asks what will happen at that time, and Bowman replies, 'Something wonderful'. Floyd has difficulty convincing the rest of the crew, at first, but a dark spot on Jupiter begins to form and starts growing. HAL's telescope reveals that the "Great Black Spot" is, in fact, a vast population