>>12667521L1 plasma magnet shield would allow the atmosphere to bulk up on its own but you’d need more material to build it up completely, shipments from Venus would be the best bet as both would benefit from it
>>12668081You could scoop up solar wind and slow it down so it forms hydrogen and beam it to Venus so it reacts to form water and graphite, once the pressure drops to acceptable, introducing lichen and plants would lock up the carbon and increase the oxygen content. You could also build the first cities there to suck up the 3bars of nitrogen and ship it to Mars to help the both of you. Then an identical L1 shield as Mars would protect the oceans
>>12670050It is because the solar wind blasted away its hydrogen and killed off its native water
