Human exploration of Mars.
The human exploration of Mars has the potential to return a rich harvest of scientific information about that planet, its possible past biological history and the prospects for future habitation by Earthly life.  The realization of that potential will require new approaches and new technologies--a whole new paradigm in space exploration.  Picture yourself exploring the surface of Mars, where your task involves conducting a detailed investigation of features larger than the United States in order to uncover a record of planetary history spanning over four billion years.
Gwynne
O
O
SETI Institute, NASA Ames Research Center, USA.
McKay
C
C
Zubrin
R
R
D001272:Atmosphere; D005118:Extraterrestrial Environment; D005544:Forecasting; D005676:Gravity Suits; D006801:Humans; D018535:Mars; D013026:Space Flight / Q000639:trends*; D018531:Spacecraft; D014867:Water
D014867:Water