Dennis Tito’s 2021 Human Mars Flyby Mission Explained (Infographic)
Practical schemes for sending humans to Mars have been on the drawing boards for more than 60 years. Pioneering space engineer Wernher von Braun, author of the 1952 book “Project Mars,” proposed Mars flyby flights using Apollo lunar spacecraft in the 1960s.
Source SPACE.com: All about our solar system, outer space and exploration