Mars has one magnetic field, but it's very weak and patchy compared to Earth's.

Here's why:

* Mars lost its global magnetic field billions of years ago. This is likely due to its molten core cooling and solidifying.

* It now has localized magnetic fields. These are remnants of the ancient magnetic field and are strongest around the planet's southern hemisphere.

* These localized fields are much weaker than Earth's. They're only about 1% as strong as the magnetic field we experience on Earth.

So, while Mars does have a magnetic field, it's significantly different and weaker than Earth's global magnetic field.