At the moment, mankind knows onlyone habitable planet. We are, of course, talking about our native land. Scientists are constantly in search of space objects that are at least a little like her. After all, if the planet has the same air temperature, pressure and other environmental conditions, then life can exist on it. But who said that terrestrial conditions are ideal for the emergence of living organisms? After all, the environment of other planets may be more suitable for life. Scientists are well aware of this and therefore are looking for potentially habitable planets according to previously known parameters. So what should be the ideal planet for the existence of living organisms?
- 1 Best planet to live
- 1.1 Ideal planet temperature
- 1.2 The ideal age of the planet
- 1.3 Ideal planet size
- 2 Potentially habitable planets
The best planet to live
There is a possibility that during the search for life inThe universe, humanity is making a big mistake. At the moment, scientists are in search of planets, the environmental conditions of which are as similar as possible to those on Earth. But our planet is far from the best for life. According to scientists, for all animals to feel comfortable, the average temperature of the planet should be slightly higher than the current... It is also necessary that on a space object there was water... And the age of the planet should not be less than three billion years - it takes time for life to arise on a space object. After all, even on our planet, life did not appear immediately.
Ideal planet temperature
Most animals on Earth live in warm andtropical rainforests. And in cold regions, living creatures are very few. If you can't believe it, remember how many animals live in Australia and how few living creatures live in Siberia. The average air temperature on Earth is about +14 degrees Celsius. This is not bad, but the researchers believe that at an average temperature +19 degrees Celsius, living creatures would feel better. With all this, there should be a lot of water on the planet, because it is the source of life and participates in many chemical processes.
The ideal age of the planet
The age of the earth at the moment is 4.5billion years. But life on it did not arise immediately, because it lacked one important component - oxygen. It took nature about two billion years to create oxygen-producing cyanobacteria. The oxygen produced by them accumulated in the atmosphere for about 1.7-1.9 billion years, and only then did its concentration reach its present level. Overall, it took our planet 3.7 billion years, or 80% of its current age, for microbes to appear on it. And only then did dinosaurs, primitive people and us appear. It turns out that scientists should be interested in planets that had enough time for life to begin... Planets that are young and too old will not work.
See also: Life on Earth - a common occurrence in the Universe?
Perfect planet size
Also, for the emergence of life, the presenceatmosphere and magnetic field that protect the object from cosmic radiation. For this, the planet must be large enough that its gravity can hold the atmosphere for billions of years. According to the calculations of space researchers, the mass of the planet ideal for the emergence of life should be 10% more than the mass of the Earth. And of course, next to it there must be a star like the Sun - after all, it is their radiation that is the trigger for the beginning of the chemical processes that create life.
Potentially habitable planets
It turns out that working on the search for habitableplanets, scientists need to pay attention to their temperature, water availability, age, size and parameters of the nearby star. At the moment, researchers know about 24 potentially habitable planets outside the solar system. They are all on the Kepler Objects of Interest. This list of space objects was created to structure the stars in which the Kepler telescope discovered planets.
Of the 24 planets discovered, only 16 are oldin the region of 5-8 billion years. And only on the surface of 5 of them the air temperature fluctuates around 9-19 degrees Celsius. Only three distant objects more or less correspond to all of the above criteria. Only to be convinced of all this and to provide irrefutable proof, researchers need to carry out many more scientific works. For some of them, there is not yet enough powerful equipment.
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However, life can exist for enoughplanets close to us. Recently, a gas was discovered in the clouds of Venus, which is produced in large quantities only by bacteria. Therefore, at the moment, scientists dare to assume that microbes can live in the clouds of the second planet from the Sun. You can read more about this discovery in this article.