> mars only has 38% of earth's gravity, 1% of the atmosphere, and 44% of the sunlight. temperatures fall to -153c (-225f) at night. mars core is dead. theres no global magnetic field. the surface is bombarded with 50x the radiation on earth. there is no ozone layer to protect from solar rays. the thin atmosphere cannot burn up meteorites, which hit the surface at full speed in principle you could change all that.
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