Like the Apollo LM, Altair's crew module is based on a sideways cylinder, but unlike its two-man Apollo ancestor, Altair is designed to carry the entire four-man mission crew to the surface while the Orion Spacecraft remains unmanned in lunar orbit.
Altair's crew module is based on a sideways cylinder. This was like the Apollo LM. Altair is designed to carry the entire four-man mission crew to the surface while the Orion Spacecraft remains unmanned in lunar orbit. This was unlike its two-man Apollo ancestor.