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The mission should have more than 3 people. That's not enough if something happens to one individual - puts a lot of stress on the remaining 2 to cover all the activities required just to get them home safely.
5 or 7 (odd numbers are better) would be safer.
Instead of a single ship, if the mission was 2 or 3 ships (with 5-7 people on each), they would have basically "liferafts" in case of problems on the journey.
And they could leave one ship in orbit around Mars (polar orbits make it easier for ships leaving the surface to rendezvous with the orbiter) - this would be a relay to Earth for communication, a source of supplies if necessary, and moral support for the team on the ground.
A supply ship (unmanned) could be sent to Mars in advance, to go into orbit (they've done that before with the Orbiters) that the manned mission could capture. It could carry:
- oxygen
- power generators
- building materials - would need to be lightweight, but that's okay because Mars has a lower gravity than Earth
- plant seeds or seedlings and hydroponics equipment - this would provide food, oxygen, and a small piece of green home on a red world
- backup communications equipment, computers, etc.
For the team on the ground, some form of radiation shelter (to protect them from solar flares and cosmic rays) since Mars doesn't have a magnetic field to stop this radiation from reaching the surface. It could some kind of hut or "tent" of silvered aluminum or mylar - it wouldn't have to be very heavy or thick, but would need to cover a large enough area to protect the entire camp.
New space suits - with lining or outer material that is almost impossible to tear, more flexible and comfortable than current suits, with backup communications systems (and GPS units - but then they'd GPS satellites in orbit before that).
Probably other things I haven't thought of right off the top of my head. But I'm sure NASA has all kinds of engineers and survival experts working on all of this (and more).
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- thanks alot, I hope I get an "A"