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When Mars's core froze it also ended its magnetosphere which protected its atmosphere from the cosmic bombardment of charged particles which from then on started to tear it away.
If we ever are to terraform Mars then we'd need to restore its magnetic field/shield. Maybe some big superconducting rings over its surface could do the trick, but it would be a herculean effort to build them.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
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