The notion of space tourism took hold in 2001 with a $20 million flight aboard a Russian spacecraft by Dennis Tito, a millionaire engineer with an adventurous streak.

2001年，丹尼斯·蒂托——一位富有冒险精神的百万富翁工程师——耗资2000万美元乘坐一艘俄罗斯宇宙飞船，自此太空旅游的概念深入人心。

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The American billionaire and world's first space tourist Dennis Tito has announced he will fund a manned mission to Mars in 2018.

美国亿万富翁丹尼斯·蒂托是首位太空游客，日前他宣布赞助2018年载人登火星计划。

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One of the things that Dennis Tito emphasized at the conference is that this is not a commercial mission.

FORBES: Dennis Tito's 2018 Mars Flyby Is On The 'Ragged Edge Of Feasibility'

Private outfits like Inspiration Mars backed by NASA engineer-turned-space tourist Dennis Tito are seeking volunteers for a Mars flight.

NPR: Astronauts Face Radiation Threat On Long Mars Trip

Shuttleworth's dream of space travel gained momentum last year when California equity fund manager Dennis Tito became the first tourist in space.

CNN: First African in space boards ISS