11.   The next big step in space tourism is predicted to be suborbital flights such as those taken by early Mercury astronauts before John Glenn orbited the Earth.

12.   Wolff is confident that there is a market for space tourism and, in the U.S. at least, it is an idea that appears to have taken off.

13.   An oft-repeated sentiment is that space tourism is far closer to reality than most people imagine.

14.   But some entrepreneurs envision a time when space tourism could more affordable and widespread.

15.   Gidzenko, a veteran cosmonaut, said all the crew members got along well, and said he had nothing against the concept of space tourism.

16.   Interest in space tourism was piqued this week, when Hilton Hotels Inc. disclosed that it is looking into the feasibility of a space hotel.

17.   MirCorp will seek additional sponsors by offering the use of Mir for advertising purposes, space tourism and private scientific and pharmaceutical research, Manber said.

18.   Russia already has started capitalizing on space tourism, something Aldrin believes could become a major industry and a primary source of funding for Mars exploration.

19.   Sessions at the three-day convention dealt with potential space ventures ranging from space tourism to asteroid mining.

20.   The challenges of space tourism would be enormous.