Mars once had a global magnetic field, generated deep inside the planet, strong enough to deflect the solar wind much as Earth’s does today. When that field faded, Mars lost its thick atmosphere and its surface water, and over time it changed from a world tha…
Mars once had a global magnetic field, generated deep inside the planet, strong enough to deflect the solar wind much as Earth’s does today. When that field faded, Mars lost its thick atmosphere and … [+4723 chars]