For more than fifty years, space exploration has been a wellspring of dreams, source images mixing scientific facts, realistic projects, and fantasy.

In space agencies, university laboratories, associations, or private companies, many projects anticipate tomorrow’s space exploration and exploitation. Some of them join important issues, such as environmental protection or energy supply. Others turn to remote planets of the solar system, the return of the man on the Moon, or the human exploration of Mars...

May we put together these pieces of puzzle in a prospective scenario describing - to the horizon 2100 - the most probable steps of the adventure? Which would be the issues, the risks, the benefits? Can we describe their most original achievements, spaceships, and architectures ?