Like Mercury, the Earth takes a beating from the sun's violent temper.
Flares, sun storms and other solar hissy fits can cause electronic mayhem for the satellites that roam above our heads.
Fortunately, the earth is protected from its radiation by a magnetic shield, a kind of force field generated by our molten iron core.
Planetary magnetic fields are shield planets their surfaces and their atmospheres from charged particles that are always coming off the sun.
The auroras that light up our polar skies are evidence of our protective shields that work.
Without it, life would not exist here.
Visit Mercury, and you will be visiting the only other planet in the inner solar system with a magnetic field.
But it's very existence defies explanation.
Now the mystery there is that in order to have a magnetic field, you need to have a interior to the planet that is at least partially molten.
Mercury, one of the smallest planets, would have been expected to be really frozen all the way through.