American space agency NASA is planning many missions to Mars, which also includes sending astronauts to Mars. NASA wants to send humans to Mars by the year 2035. This journey is not going to be easy. Just a one-way journey i.e. from Earth to Mars will take 6 to 7 months and a distance of 40 crore kilometers will be covered. The plan is for astronauts to stay on the surface of Mars for 500 days.