We can't stay there because the air is bad but we can take oxygen tanks to breathe there.
We can't not take any because it is heavy but we can change it we can get a rocket that is contour by the people nasa so no one has to go space we can control it by the ground like you have a toy rocket.
On mars you will need a lot of food because you need food so you dont starve to deaf. If you have no food on mars you will survive 2 weeks.
Shelter challenge: you need shelter to protect yourself from the sun, and to keep you warm and you need a greenhouse to grow plants and other stuff.