Neptune And Uranus Have A Magnetic Mystery — But The Case May Finally Be Cracked

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When NASA's Voyager 2 spacecraft made its way to outer regions of the solar system in the late 80's, it noticed something odd. Both of the ice giant planets, Uranus and Neptune, lacked what's known as a "dipole magnetic field." This was in stark contrast to our own rocky world, as well as the two gas giants Jupitar and Saturn .

As dense materials near a planet's surface cool, they tend to sink into the planet's interior. On the other hand, hotter materials near the planet's interior will rise. The combination of sinking and rising materials creates convection, leading to the movement and mixing of materials within a planet. And if the interior of a planet is electrically conducting (as in, made of liquid metal or water), the convecting material — often described as a dynamo — will generate a dipole magnetic field. Think of it like a magnet with north and south poles. It is this process which generates Earth's magnetic field — the protective barrier that shields us from charged particles.

This process, however, is absent from Uranus and Neptune . So, scientists wondered: Why would that be?

"We now have, I would say, a good theory why Uranus and Neptune have really different fields, and it's very different from Earth , Jupiter and Saturn," Militzer said in a statement.

Knowing this, 10 years ago, Militzer tried to simulate with computers the interiors of these worlds by cramming roughly 100 atoms of carbon, oxygen, nitrogen and hydrogen (in proportions that mirrored their abundances at the early stages on the solar system ) at pressure and temperatures that mirrored their interiors. Yet, they yielded no distinct layers.