How Did Mars Lose Its Magnetic Field And Then Its Oceans?


The solar system is a tough place. Our Sun, which gives us life, can also take away our lives. If it were not for the protective effect of our magnetic field, we would not be safe in our world.

Earth and Mars

Earth and Mars

After all, the sun produces enormous amounts of radiation. Without a magnetic field, solar winds destroy our atmosphere, and then the oceans evaporate and disappear into space. In other words, the end of the Earth would be like Mars.


Earth is the only rocky planet in our solar system to have a strong magnetic field. This is why Mars and Earth are so different from each other today. But billions of years ago, Mars also had a strong magnetic field. So what happened? After all, we know that Earth, Mars and all our neighboring planets were born from the same cosmic matter. Therefore, learning the answer to this question will be an answer that will shed light on our own distant past and future.

How did Mars lose its magnetic field and oceans?

Mars is a cold and dry planet today. Also, its atmosphere is too thin for water to remain liquid. But geological evidence suggests liquid water abounded on the ancient Martian surface. This is because Mars once had a protective magnetic field partially similar to Earth’s. But the magnetic field disappeared. A team led by Shunpei Yokoo from the University of Tokyo recently tried to explain to us how this happens as a result of their experiments.

For this, the researchers recreated conditions in a laboratory on Earth that were expected to be in the core of Mars billions of years ago. He first made a material using a mixture of iron, sulfur and hydrogen believed to be found in the core of Mars. The team then placed this mixture of iron, sulfur and hydrogen between two diamonds. He then heated it with a laser, simulating the high temperatures and pressures found in the core of a rocky planet.

The plasma waves emanating from the upper atmosphere of the Sun are called the solar wind. Electrically charged particles in solar winds also create aurora landscapes observed in polar regions.

The plasma waves emanating from the upper atmosphere of the Sun are called the solar wind. Electrically charged particles in solar winds also create aurora landscapes observed in polar regions. (Source :

Sample observations with X-ray and electron beams allowed the team to image what was going on during melting under pressure and even mapping how the composition of the sample had changed during that time. As a result, the material split into two different liquids, one iron and sulfur and the other iron and hydrogen. The hydrogen-containing liquid went up because it was less dense. And as the fluids separated, convective currents formed.

These currents would activate a magnetic field that could conserve hydrogen in an atmosphere around Mars, similar to those on Earth, which would allow water to exist as a liquid. However, such currents are short-lived. As soon as the two liquids are completely separated, the currents will stop. Then the magnetic field disappears. And when that happens, hydrogen in the atmosphere is pushed into space by the solar wind. This leads to the breakdown of water vapor and eventually to the evaporation of the oceans. Apparently, all of this took place on the planet Mars about 4 billion years ago.

Will Earth’s Magnetic Field One Day Disappear Like Mars’ Magnetic Field?

As a result of this article, it is possible that you think that the Earth will lose its magnetic field one day and that it will end up like Mars. But do not be afraid right away. As the team points out, that won’t happen for at least a billion years.

This separation of iron-sulfur and iron-hydrogen liquids is also seen on Earth. However, there is an important difference between Mars and Earth. This is temperature. The temperature of Earth’s core is much higher than that of Mars’ core. At these high temperatures, the iron-sulfur and iron-hydrogen liquids mix with each other. So we don’t have to worry for a long time.

But these results have implications for the search for habitable exoplanets. The main criterion for routinely determining whether an extrasolar planet can host life is the presence of liquid water on the surface. But perhaps a strong magnetic field should be another key measure to determine if the planet can hold onto its water. This study also confirmed that planets need a shielding magnetic field to block harmful radiation.


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