The document discusses the history and future of space tourism. It notes that space tourism began in 2001 when Dennis Tito became the first space tourist, paying $20 million for a trip to the International Space Station. Currently, several companies like Virgin Galactic and SpaceX are developing technologies to take space tourists on suborbital flights, with costs decreasing to around $200,000 per ticket. The document predicts that space tourism could become a $10 billion industry within two decades as costs continue to decrease and more companies participate.