A whole buttload of hot metal moving fast in the core of the planet. ****************************************************************** Here's a better answer: - Rapid rotation, and liquid conducting interior- electric charges move about= Strong magnetic field --You are welcome! - Hershey
Earth's magnetic field plays a crucial role in protecting life on the planet by shielding it from harmful solar radiation and charged particles. Without this magnetic shield, these harmful particles could strip away the atmosphere and make the planet uninhabitable.
Mars has a magnetic field.
no
liquid core
The size and fluidity of the core of the planet.
The core of the planet must be a ferromagnetic material (like nickel-iron), and the core must be molten so that the mobile fluid will generate the field through dynamo action. It is this dynamo action that is thought to generate the earth's magnetic, and is believed to be the source of the magnetic fields of other planets. It is important to note that this is a widely accepted idea, but is not proven. The tools necessary to prove it do not currently exist.
Jupiter
Planet Earth
We are already on a planet with a magnetic field and yes magnetic fields are what protect the planet from various dangers. Not to mention nearly every planet we have seen has a magnetic field (save venus). It is believed that the magnetic fields of planets save them from solar winds which would otherwise slowly strip the atmospheres of planets by taking out chunks of atoms every time they hit. Mars has an extremely weak (or none according to many scientists) magnetic field and as such the solar winds bash into it and scoop out ions from the planet. Overall conclusion: Yes, you want to visit a planet with a strong magnetic field, it's basically more protection (in theory at least).
Scientists believe Jupiter has a liquid metallic hydrogen core which allows it to form a strong magnetic field. Trapped magnetic particles form radio waves which are amplified by the planet's many moons and which are released into space.
The magnetic force on Earth is called Earth's magnetic field or also the geomagnetic field.
All planets have magnetic fields. I believe that in most cases, this magnetic field can act as a shield.