4 ms·

Mars has isolated pockets of "mini magnetospheres" that are suitable enough to block charged particles. http://www.space.dtu.dk/english/Research/Universe_and_S

• maxk42 9y ago
  I think he was assuming the subject was terraforming. Without a magnetosphere, the atmosphere will keep being blasted off into space continuously, and it'll be impossible to terraform.
  • mkl 9y ago
    Continuously, but slowly, over very long time scales. Maintaining an atmosphere suitable for us is probably far easier than constructing it in the first place.