Since the beginning of the 21st century, people have become more and more eager to fly into space and carry out their dream space travel. Although it is not yet realistic to achieve true space travel, what is certain is that this day will eventually come in the not too distant fu

Since entering the 21st century, people have become more and more eager to fly into space and carry out their dream space travel. Although it is not yet realistic to achieve true space travel, what is certain is that this day will eventually come in the not too distant future.

However, once they leave the protection of the earth, people have to face various dangers at all times.

There are various particles in space, some are only as big as dust, some are larger, as big as pebbles, and are called meteoroids . They are all very fast, reaching tens of thousands of kilometers per hour, and they may become a fatal threat to space travel.

There is a more deadly threat, which we can't see or touch, but is more terrifying than meteoroids. They are cosmic radiation.

We all know that the sun nurtures life on the earth, but the sun has also been emitting harmful radiation. Fortunately, the earth's own structure protects humans from the sun's deadly radiation.

First of all, we have the protection of the atmosphere, which can absorb some harmful radiation. More importantly, the earth has a strong magnetic field, which acts like a "shielding wall" and blocks most of the sun's radiation.

At the North and South Poles of the earth, without the protection of ozone layer and magnetic field, solar radiation directly hits the earth, forming beautiful aurora.

Although the sun is 150 million kilometers away from the earth, there are hundreds of millions of high-energy particles flying at the speed of light in every square centimeter of space per second. These high-energy particles are very dangerous to the human body and can destroy the DNA molecules of the human body.

In addition to solar radiation, there are other high-energy radiations from the universe, such as galactic cosmic radiation, super radiation caused by distant supernova explosions , etc., which are all potential threats to the earth.

Once you leave the earth, it is equivalent to exposing yourself to those high-energy radiations. It is scary to think about it. Without the protection of protective clothing, you will die soon.

The earth's magnetic field protects people from those high-energy radiations, and we silently enjoy the benefits that the earth brings to us. Although we cannot see or touch the earth's magnetic field, we know that it is always around you and me, protecting us. It also protects the earth's atmosphere from being blown away by the violent solar wind.

What will happen if the earth loses its magnetic field protection? Just look at today's Mars .

Scientists have discovered through research that Mars billions of years ago was very similar to the Earth today. It was once full of life and the surface was filled with liquid water. However, due to the small mass of Mars, the core stopped moving, causing the magnetic field to disappear. Without the protection of a magnetic field, the Martian atmosphere was blown away by the solar wind, almost all liquid water evaporated, and Mars became a dead planet!