Believe it or not, there have been 2 Earths in the Solar System

Recently, a study by the University of California (USA) has concluded that our Earth today is a combination of two planets from more than 4.5 billion years ago.

In the past, scientists believed that the Moon was created by a powerful collision between Earth and a smaller planet named Theia . The collision caused Theia to break, creating our Moon today.

The moon was created by a powerful collision between Earth and a smaller planet named Theia.

However, if so, the chemical composition on the Moon must be different from ours, since most of the Moon was made by Theia. But through the practical tests of the University of California, the Moon has the same oxygen isotopes as us, namely O-17 and O-18.

The collision between Theia and Earth before was extremely strong.

This proves that the collision between Theia and Earth before was so strong , that the two planets melted together, forming the new Earth. During this process, a fragment broke out to form the Moon.

If curious, the video below will give you a more intuitive look at how the Moon was created.

We do not see any difference between oxygen isotopes on Earth and the Moon; they are identical. Edward Young - Professor of geology and astronomical chemistry said

Professor Young said: " Theia has joined the Earth and the Moon , which explains why we don't see Theia's sign on both planets."

Apollo 17 moon rock samples brought back.

This event took place about 100 million years after the Earth was formed - about 4.5 billion years ago. At that time, Theia was a small-sized planet, thus unable to "survive" after the collision.

According to Professor Young, without that event, Theia could absolutely reach Mars or Earth. Not even ruling out the possibility that Theia could still harbor life.

The study is published in the journal Science.