There is little-to-no magnetic field on Mars. Only about 27 humans have ever ventured outside of Earth’s protection and not for extended periods...factors conveniently-omitted from a Sun article. Fitting.
A manned mission to Mars is lunacy, an abominable waste of resources until we can achieve space travel absent chemical propellants and provide similar protection to space travelers we enjoy here on Earth.
The Moon is an excellent neighborhood space laboratory; Mars is a fool’s errand.
I’m aware that a mission to Mars, at least in the next 50 years or so, would be a suicide one. They’d have to deal with cosmic rays, solar flares, CMEs, micro-meteorites, etc.