Panama photography first prize

Looking up at the stars, we often feel a little confused. Are we really lonely in the vast universe? To discuss this problem, we need to look at how life came into being. At present, there are two main views on this issue. One thinks that life is naturally produced on the earth, and the other thinks that life is? Foreign? .

It can be seen that no matter which viewpoint you stand on, you can draw a conclusion that life can be born in a suitable environment. What is that? The right environment? And then what? The answer is obvious, an environment similar to the earth, which is it? The right environment? .

Today, thousands of exoplanets have been discovered outside the solar system, which shows that planets are everywhere in the universe, and the number of planets in the universe is not less than that of stars.

We can take the Milky Way as an example. The Milky Way has 200 to 400 billion stars. According to the above inference, the Milky Way should have at least 2 trillion planets.

Living conditions are very difficult. It requires the planet not to be too big or too small, but also to have enough water and a suitable atmosphere. It is also required that the planet is located in the livable zone of the main star. Most importantly, its main star must be stable for a long time? Burning? .

In the past, most scientists thought that life could only be born around yellow dwarfs like our sun, because stars bigger than the sun? Burning? Time is too short, and stars smaller than the sun have insufficient energy. Planets in their livable zone will become unsuitable for life because they are too close to the main star.

But the new theory points out that in fact, many red dwarfs smaller than the sun can also allow life to exist around them. It should be pointed out that among many stars in the universe, red dwarfs have the largest number and the longest life cycle. Therefore, the new theory has greatly increased the number of livable planets predicted by scientists.

Through the analysis and theoretical derivation of the existing observation data, scientists estimate that our Milky Way alone has about 654.38 billion livable planets. It can be seen that this is a huge number, and it is easy for us to infer that many lives must have been born on these livable planets.

From the birth of life to the evolution of civilization, it must be a small probability event, but what if it is 654.38+00 billion? Earth? There is no alien civilization in the world, so I'm afraid no one will believe it. A very simple fact is that even if the probability that a civilization was born on a livable planet is 1, there should be 100 alien civilizations in the Milky Way.

Note that this is only the case of the Milky Way. If we enlarge this range to the entire Hubble volume, we can almost 100% determine that there will be aliens on a planet in the universe.

It is worth mentioning that the above discussion is only carbon-based life. There is no denying that life in the universe is likely to be diverse, such as silicon-based life, amino-based life, boron-based life and so on. Maybe there are more life forms in the universe than we thought.

To sum up, in the vast universe, we humans will never be lonely, just as the famous astrophysicist carl sagan once said: The universe is so big, if there are only humans, wouldn't it be a waste of space? ?