In the universe there are no other living beings besides humans

Whether there is other life in the universe besides the Earth, scientists suspect to find evidence.

Hello! Is there or how many celestial bodies like Earth are there in the universe. The organic molecules on the earth do not fly from outside the sky, but they are possessed by themselves, and substances such as water and oxygen, which are necessary for the existence of life, are also abundant in the embryo of the earth.

What is important, then, is the external conditions that cause the evolution of these related organisms, that is, the light and heat conditions from the sun, which are the external conditions that enable the evolution of the earth's organic matter into living matter. In other words, because the earth has the two conditions of organic matter and solar light and heat, it also has the necessary conditions for the existence of life. In this way, we just need to explore whether there are planets and star systems in the universe like the Earth-Sun.

According to research, there are about 1% of stars of the same type as the Sun in the Milky Way, and at least 10% of them have planets, that is, 100 million stars like the Sun have planets. So among these 100 million planets, are there any planets that are completely consistent with the internal and external conditions of the Earth? In fact, there are countless galaxies like the Milky Way in the entire universe.

According to the theory of probability, we can think that there must be celestial bodies in the universe that are the same or similar to the earth in addition to the earth, that is, there must be living planets like the earth in the universe, but we have not discovered each other.

What, then, is the best way to connect with each other in the vast universe? In terms of human wisdom and scientific and technological level, the best means is electromagnetic wave communication. Radio telescopes currently in use can receive very faint signals from space, but unfortunately, there is no indication that these Nobunaka Yuho carry information from advanced intelligent beings.

Another way is to compile symbols that represent the characteristics of the earth into "passwords" to make "earth business cards" and use electromagnetic waves to emit them into outer space. If aliens are about as intelligent as humans, they have the opportunity to receive and decipher the content of our signals, and then they send them to Earth. But even electromagnetic waves emitted by the nearest star of exactly the same type as the Sun would reach the Earth.

Light-year. Suppose this star has planets, and there are highly intelligent life on the planets, and they receive signals and feedback information, and a round trip is enough.

Light-year. Therefore, it is almost impossible for humans to meet them.

Is there only one life in the universe that exists on Earth? The characteristics of living matter on earth are organic matter with hydrocarbons as the main body, oxygen as the exchange material for metabolism, and water as the basic substance for the formation of life. After these conditions are met, at the right temperature, organisms can be formed.

If life could be formed from other substances, it would certainly not be in environmental conditions like Earth. But as long as they are living beings, they must also exchange matter and energy to maintain life activities.

All in all, theoretically, earthlings are not lonely, and there may be "aliens" in the universe. However, in practice, so far, no existence of life objects on other planets has been discovered, let alone "aliens" coming to Earth as guests. Thank you!

If life must be made up of proteins, then earthlings are unique from known observations.