Magnetosphere

The Magnetosphere is the region of space surrounding a celestial object that is affected by the objects magnetic field.

Ah, i see. Well that's not too ticrky at all!"

Effect

A magnetosphere of sufficient strength will serve to protect the occupants of a planet from the harmful solar wind and radiation of their star and the surrounding cosmos. The results of this protection can be seen as aurorae in the far northern and southern latitudes.

Because Mars lacks a significant magnetic field, it's magnetosphere offers negligible protection from solar wind and radiation.