1. That NASA has already sent a rover to mars and soon will send people to mars to investigate for any forms of life on mars
2. About two years including getting there and probably getting back
3. Space suits, plenty of food, air, and shelter.
4. The astronauts could get lost or not being able to get back!
5. Clothes, or a phone for communication, a picture of relatives or friends and a computer for if the phone does not work as a last resort communication plan.