Answers to Ilya:

1) regarding space tourism: you are right, I was talking about state sponsored spaceflight only (and didn't make that clear, sorry). There probably is a market for 'billionaires in space', but if it will get beyond that? I don't know.

2) Why Mars is the 'next Everest' and not Titan or Pluto?
Well, after Mars we have set foot on our Moon (a first) and another planet (a first). After that you can do only a second, third, etc. landing on another planet. The next 'first' would be to go to another star. Besides that you simply can't reach any other planet with chemical rockets. For manned spaceflight there is only 1 planet in the entire universe, Mars.

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