The habitability of a planet depends on many factors. One is the existence of a strong and long-lived magnetic field. These fields are generated thousands of kilometers below the planet’s surface in its liquid core and extend far into space—shielding the atmosphere from harmful solar radiation.
![](https://scx1.b-cdn.net/csz/news/tmb/2020/lifeonearthw.jpg)
Source:
https://phys.org/news/2020-10-life-earth-moon-defunct-magnetic.html