Mars Direct
（重定向自Earth Return Vehicle）
![The Habitat Unit and the Earth Return Vehicle on Mars.](/Images/godic/202501/10/Mars_Direct_Base_Art_0013917.png")
![Artist's rendering of Mars Semi-Direct/DRA 1.0: The Manned Habitat Unit is](/Images/godic/202501/10/Mars_design_reference_mission_33918.jpg")
![](/Images/godic/202501/10/Mars_Hubble3918.jpg")
Mars Direct is a proposal for a human mission to Mars which purports to be both cost-effective and possible with current technology. It was originally detailed in a research paper by Martin Marietta engineers Robert Zubrin and David Baker in 1990, and later expanded upon in Zubrin's 1996 book The Case for Mars. It now serves as a staple of Zubrin's speaking engagements and general advocacy as head of the Mars Society, an organization devoted to the colonization of Mars.