Mars orbit rendezvous (MOR) is a concept for space travel, where a spacecraft takes off from Mars, such as a Martian ascent stage, and does a rendezvous in Mars orbit with another spacecraft.
Mars orbit rendezvous (MOR) is a concept for space travel. A spacecraft takes off from Mars. This is such as a Martian ascent stage. A spacecraft does a rendezvous in Mars orbit with another spacecraft.