The only two space tourists so far, American Dennis Tito and South African Mark Shuttleworth, got no further than the ISS for $20m each and no Russian cosmonaut has ever orbited the moon.

• 参加“月球之旅”的观光客需要支付的1亿美元中，包括月球旅游的成本费9000万美元和用于支付飞船船长的费用350万美元。