The Earth as a habitable planet can be rarer than we think. Scientists use computer models to prove that our planet has a mild climate and not the ice world because there is a large star near the original solar system. The star provides radioactive elements to the emerging inner planets that evaporate some of the water that would have been delivered to them.
Scientists once thought that the earth was originally a huge melting body that gradually cooled. After several billion years of geological development, the earth still maintains its warmth. Most of the earth's heat comes from the sun. But it is not so. The interior of the earth is very warm and very active. Why? The answer comes from the discovery of radioactive substances. It has been found that the presence of radioactive substances such as uranium provides an energy source for the interior of the earth, so that it retains heat even after many cooling cycles.
Now that scientists have learned more about how planets are formed, one of the latest computer simulations is that planets such as Earth are very strange. We think it's a water world – compared to planets like mercury or Mars, making the ocean covering 75% of the earth's surface a water world. But the simulations show that the earth in a planetary system like ours would be a great ice hockey, and the frozen sea is several miles thick.
According to Michael Meyer, an astronomer at the University of Michigan, computer simulations give some answers if it is assumed that there is a large star in the area that the solar system forms. When these stars reach the end of their lives, they release a large amount of matter, some of which consist of radioactive substances such as aluminum-26.
Simulations show that these elements are present in the stars of the new planet (and its neighbors), providing additional heat that helps evaporate most of the water and prevent the global sea from forming a layer of impenetrable ice on the seabed. This enables the carbon cycle to begin, which helps to stabilize the climate and create life-friendly surface conditions.
The important thing about this discovery is not only that it reveals how the earth is formed, but it also helps space scientists predict which exoplanets outside the solar system deserve attention or signs of life. By finding the right radioisotope you can predict if the candidate planet is a ground plane or a large ice world. In addition, a better understanding of the mechanism can help calculate how many terrestrial worlds in the galaxy.
"It's great to know that radioactive substances can help dry the wet system and explain why planets within the same system will have similar properties," Meyer said. "But the radioactive element heating may not be enough. How do we explain our planet, which is very dry compared to the planets formed in our model? Perhaps Jupiter is also important to keep most cold objects away from the sun. Internal system."
The study was published in Nature Astronomy.