Thursday , January 21 2021

Strong stars can be the cause of the earth, not the ice world – scientific exploration – cnBeta.COM



The Earth as a habitable planet can be less frequent 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 evolving inner planets that evaporate some of the water that would have been delivered to them.

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Scientists once thought that the soil was originally a large melting body that gradually cooled. After several billion years of geological development, the soil still retains its heat. Most of the earth's heat comes from the sun. But that is not the case. The interior of the earth is very hot and very active. Why? The answer comes from the discovery of radioactive elements. It has been found that the presence of radioactive elements such as uranium provides an energy source for the interior of the earth, so that it can retain heat even after many 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 must 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, assuming there is a big star in the area formed by the solar system. When these stars reach the end of their lives, they emit much of the matter, some of which consist of radioactive elements such as aluminum-26.

Simulations show that these elements are present in the stars of the new planet (and its neighbors), which provide additional heat which helps evaporate most of the water and prevent the global sea from forming a layer of impenetrable ice on the seabed. This allows the carbon cycle to start, helping to stabilize the climate and create vital 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 are worthy of attention or signs of life. By finding the right radioisotope, you can predict whether the candidate planet is an earthly planet or a great ice world. In addition, a better understanding of the mechanism will help calculate how many earth-like worlds in the galaxy.

"It is great to know that radioactive elements can help dry the wet system and explain why planets within the same system will have similar properties," Meyer said. "But the radioactive element may not be enough. How do we explain our planet, which is very dry in relation 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.


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