Why would you choose to go to Mars’ moon Phobos rather than directly to Mars?
This plan is just a concept. It is US policy right now to go to Mars and to the surface of Mars at some point in the 2030s. However, the Jet Propulsion Laboratory (JPL) came out with a plan in which they decided that it might be useful to have a manned precursor mission to Mars orbit first, and in particular go to Phobos and test out key technologies before using it as a stepping stone to Mars.
What key technologies still need testing?
When mission
