Is there life in the

Although the planets lie far away from the host stars, they start to heat up and retain that hot temperature. One of the recent studies shows that the temperature of the planets is often unstable. Therefore, hot planets often have a hard time keeping water in liquid form - even if they are located in a temperate area around its stars, known as " the area with can live ".

The author conducted the study of Jun Korenaga - a geophysicist at Yale University who replied to Space.com: " All living things in" livable areas "cannot wait until the planet evolving like the Earth we live in. Even if you consider an Earth like Earth made of chemical components - there is enough water and more - the planet will not be able to become "2nd Earth" if it is too hot or too cold . "

"Sweating" heat

In the past 60 years, most scientists think that the planets are generally in " moderate " areas.

For example, the heat from the center of the Earth rises through the sheaths and is released through the earth's crust, in the process it is called " convection mantle ." Because the convection coat accelerates when the temperature inside the planet increases, the emitted heat may be more or less than that produced in a planet's " mind ", these thoughts have turned lost.

The temperature of a planet - and whether water can survive in liquid form, an important element of life maintenance - may depend on the history of that world.(Photo source: Michael S. Helfenbein / Yale University).

" This is similar to hot-blooded animals with a lower body temperature when sweating, " Korenaga said.

However, by studying the Earth's crust, the Koren realized that a planet does not necessarily need to reach this equilibrium point. As computer simulations have been improved since the ideas proposed in 1960, a more realistic model of the Earth's crust has revealed problems with early theories.

Korenaga said: " The Earth's crust can adjust itself if it's made of simple materials like corn syrup ." That's because these simple materials can be transformed faster than their complex materials - allowed for self-regulation. " However, Earth's crust is made of very complex materials, " he added.

Korenaga said, " With how the Earth's rock research has been distorted and how does the convection coat adjust itself? " Korenaga determined that this process does not easily affect the internal temperature of the planets. So, the heat emission on the planet's surface - or " sweating " - does not necessarily end with balancing the amount of heat generated inside the planet. However, this clarification does not necessarily have to be widespread.

David Stevenson, a planetary research scientist at the California Institute of Technology - who did not participate in the study, told Space.com: " Korenaga researcher is applying a relatively narrow definition". rules ", but that's very interesting ".

New studies were published last week in Science Advances magazine.

"Hot start ", hot surface

The surface temperature of a planet has a strong impact on what can exist there. If the temperature rises too high, water cannot exist in liquid form, making it a major challenge to life as we know it has grown. When a planet is self-regulating, the temperature may be stable but if a planet is constantly "sweating" the surface may blow excessive heat to the water, causing the water to evaporate.

Therefore, detailed information about the formation and evolution of a planet gave the final clues to its temperature. Korenaga suggests that these materials help form planets along with any effects from large asteroids or comets that may have gone through, which could help determine the temperature on the planet's surface.

Korenaga said: " I guess that a planet with a hot start will maintain its hot temperature and vice versa, " although he also warned that the process of forming planets has not been clarified.

The surface temperature of a planet has a strong impact on what can exist there.

Stevenson said: " But those details are of secondary importance in deciding whether an area can live or not of a planet. The Earth absorbs 5,000 times more energy from the sun than the surface. inside. Things inside play a direct role in determining the surface temperature . "

According to Stevenson, the habitable area is more closely related to the atmosphere of the planet - the things he refers to are related to each other, but there is no need to define what is structured. inside.

But Korenaga points out: " Scientists' understanding of what's inside the planet affects the atmosphere based on a long-term idea, self-regulating planets ."

" The current atmospheric components affect geological activities for several billion years and our understanding of the relationship between the atmosphere and the interior is heavily dependent on, " Korenaga said. The self-regulation concept of the earth's crust, so we need to start from scratch to establish a suitable relationship between the atmosphere and the internal temperature . "

Therefore, the habitat of a planet in the "habitable zone " may not meet the necessary conditions of a planet that exists in life. Korenaga added: " Its internal temperature must also be consistent . Even when starting with the same chemical composition as in the beginning, the initial temperature difference will lead to internal components. different atmospheres, thus creating different living areas ".

Korenaga explained further: " However, it is not feasible to conduct research on the inner contents of these strange planets now. All we can do is observe the surface - the atmosphere. - and guess what's inside . "