Why is Mars a Dead Planet? + more videos |

Why is Mars a Dead Planet?
Firstly, Mars's core cooled and solidified too quickly, causing it to lose its magnetic field.
Secondly, without a magnetic field, the solar wind stripped away Mars's atmosphere.
Thirdly, without an atmosphere, the water on Mars's surface completely evaporated.
Lastly, as most of Mars's volcanic and tectonic activity occurred over three billion years ago, it is considered a dead planet now.
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