Solar wind stripped Martian atmosphere away
Solar wind and radiation are responsible for stripping the Martian atmosphere, transforming Mars from a planet that could have supported life billions of years ago into a frigid desert world, according to new results. Ref. Source 7l.
If mars does not have a metal core to give it the protection that earth has with a magnetic field to protect it from the solar wind then we would not be able to support life on this planet without the use of shelter. A domed city, farms and other things lined with some magnetic field would be needed to protect humans there.
Lead lined windows to withstand the radiation, Heavy built construction to survive massive storms and still clear enough to let in sunlight to warm the place. Needless to say mars is getting very close to being out of the Goldilocks zone and not looking very good otherwise.