Mars lost its magnetic field 4.5 billion years ago according to this article:

Mars lost its global magnetic field during the time of this heightened activity. After 500 million years, the Martian atmosphere is substantially destroyed, all due to the disappearance of Mars global magnetic field.

When will the Earth lose its magnetic field and atmosphere?

I am wondering: how much time do we have to find another planet to live on?

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    $\begingroup$ My guess is that losing the magnetic field is a lesser worry. We have only a billion years at most before the Sun becomes too bright for photosynthesis to continue (the air warms and carbon dioxide erodes rocks faster, thus starving green plants). We're outta here, one way or another, before the much slower process of core solidification and loss of magnetic dynamo come into play. $\endgroup$ Jun 25 at 20:35

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