Scientists say precious metals, including gold and platinum, came from space billions of years ago.
Researchers at Bristol University has concluded after analyzing samples of some of the world's oldest rocks in Greenland.
According to them, the isotopes found in these formations - atoms that identifies the origin and age of materials - are clearly different from those that originated on Earth.
This confirms the theory that the precious metals we use today came to earth in a violent shower of meteors when Earth was only 200 million years.
"Our work shows that most of the precious metals they are based on our economies and many industrial processes were added to our planet by coincidence, when the Earth was hit by about 20 billion tons of space equipment," says Mathias Willbold, who led the research at the University of Bristol.
During the formation of Earth, the planet was a mass of melted mineral, which was constantly hit by large cosmic bodies.
The center of the Earth was created from liquid metal that dropped.
According to scientists, the amount of gold and other precious metals present in the heart of the planet would be enough to cover the entire Earth's surface with a layer of four meters deep.
The concentration of all the gold and other metals in the center of the planet should have left the outer layers of the Earth practically free from the presence of these materials, so the origin of the gold surface and explore the Earth's mantle (the layer just below the earth's crust ) had already been the subject of speculation in the scientific world.
The study published in the journal Nature was the first, according to the researchers, able to perform isotopic measurements of the quality needed to find that the precious metals came from space.
Scientists say future studies may try to find out more about the processes that caused the meteor that hit the Earth's mantle to the mix.
Then geological processes formed the continents and the precious metals in concentrated deposits of minerals that are mined today.