luiz, no problem.
I guess I should learn to be more expilicit. After all, how would you know what's inside my head. Only what was written into the reply box can finally be read by you.
About the cost of moon and mars missions as compared to robot explorers:
Apollo Mission: 150 billion $
Mars Mission: 400 billion $
Mars Global Surveyer: 220 million $
Man, we could flood the solar system with about 1000 (in words: thousand) robot probes for the price of one manned mission.