The existence of life on earth and human civilization are telling us the possibility of the universe. Since human beings can emerge and evolve civilization, there will be other life in the universe. There are about 200 billion stars in the Milky Way, most of which are smaller than the sun, so they live longer than the sun. Almost every star has its own planet. According to the range of the solar system's earth orbit, the livable zone of stars can be inferred, and life can be produced if conditions are right.
Among the 200 billion stars, it is hard to say how many planets are in the livable zone, but the influence range of stars is around 1 light-year, which is not very large. There must be other planets in the livable zone. Scientists' observations also confirm this statement. So far, scientists have discovered many terrestrial planets, some of which are very similar to the early environment of the earth and can maintain liquid water. There are gases such as methane and carbon dioxide in the atmosphere. Carbon-based life born in the earth's environment may still be born on other planets.
The formation of life requires many conditions. Life on earth alone is by no means liquid water and small molecular gas, because there is another more important element-phosphorus. Although the distribution of phosphorus in the universe is not very common, it is not only possessed by the solar system, which means that life may still be born on other terrestrial planets. Life in the universe is not necessarily a carbon-based life form on earth.
In the past, scientists have sent information to the vast universe, but after many years, there is still no reply. The universe is too big, and the human signal disappears before it travels far. Humans have not been able to get out of the solar system, and the scope of the universe explored is still very small. Humans only know that there is life in the solar system, but they can't deny the existence of other life in the universe.