Human mission to Mars
Author	Year of proposal	Year of planned flight	Number of astronauts	Number of Mars ships	Weight on LEO [ton]	Number of launchers
Werner fon Braun	1956		12	2	3600	40
Bono	1960	1971	8	1	3700
Koroljov	1962			1	1600	20
North American Aviation	1962	1977	5	3	1200
Sohn	1965	1982	6	1	1000
Parkinson	1981	1994	5	3
Zubrin	1991	1996	4	2	220	2
NASA DRM 1.0	1993	2007	6	4	850
NASA DRM 3.0	1998		4	3	500
ESA	2004	2033	6	1	1500	28
NASA DRM 5.0	2007	2029		3	900	8
SpaceWorks	2007	2033	3	3	500	5
Ajgl	2007	2050	2	4	1000	8
NASA DRA 5.0	2009	2035	6	3	900	8