For example, one vehicle takes off from Mars, such as a Martian ascent stage, and does a rendezvous in Mars orbit with another spacecraft.[1] Applied to a Mars sample returnorhuman mission to Mars, it allows much less weight to be sent to the surface and back into orbit, because the fuel needed to travel back to Earth is not landed on the planet.[1] It has also been proposed for uncrewed Mars sample return plans.[2][3]
In one mission proposal, MOR was planned for a Mars Descent-Ascent Vehicle (DAV) and Mars Transit Habitat, where a crew would transfer to the DAV after traveling to Mars on the habitat.[4] This allowed the Mars DAV to be launched separately from the transit habitat, and without any crew.[4]
A related concept is a Mars flyby rendezvous, where spacecraft do not enter orbit but rendezvous near the planet.[5] Mars flyby rendezvous was evaluated at NASA's Manned Spacecraft Center in the 1960s.[5] At that time NASA developed designs for a combination of a Mars lander, short-stay surface habitat, and ascent vehicle called a Mars Excursion Module (MEM); the ascent stage performed the rendezvous.[5] Compared to MOR, a flyby rendezvous means one spacecraft does not have to orbit Mars.[5]
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Page 8-9 in Chapter 2 of David S. F. Portree's Humans to Mars: Fifty Years of Mission Planning, 1950 - 2000, NASA Monographs in Aerospace History Series, Number 21, February 2001. Available as NASA SP-2001-4521.
