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100,000,000,000,000,000,000,000,000,000,000, or one hundred nonillion, was a year speculated to be the end of the universe itself. (PDA: The Infinity Doctors) However, there was some evidence that the end might have come much earlier. In the year one hundred trillion, the Tenth Doctor indicated to Martha Jones and Jack Harkness that the universe was closer to dying than not. They also encountered Chantho, Yana (The Master) and the Futurekind. (DW: Utopia)