The exploration of Mars has been a goal of national space programs for decades. Preliminary work for missions that would involve human explorers has been undertaken since the 1950s, with planned missions typically being stated as taking place 10 to 30 years in the future when they are drafted. The list of manned Mars mission plans in the 20th century shows the various mission proposals that have been put forth by multiple organizations and space agencies in this field of space exploration. Plans have varied from scientific expeditions in which a small (2 to 8) group visits Mars for a period of a few weeks or year, to the permanent colonization of Mars.
This infographic shows the different attempts to travel to Mars and how we’ve been getting closer to achieving that goal –