) * The starship Horizon visits Sigma Iotia II, a planet that was home to a pre-warp society. One of the ship's crew members accidentally leaves behind a book, Chicago Mobs of the Twenties. The Horizon is lost shortly after leaving the planet, but transmits a radio frequency distress call that is not received by Starfleet until almost a hundred years later. (TOS: "A Piece of the Action" ) * The white rhinoceros becomes extinct on Earth. (TNG: "New Ground" ) * The Genome colony on Moab IV is founded. (TNG: "The Masterpiece Society" )