Chapter 16 Aliens

Our sun is one of 150 billion stars in the Milky Way, one of more than 100 billion galaxies that have been observed.Taking the Milky Way as an example, there are about 100 billion planets suitable for living things and humans, not including other galaxies.In terms of probability, if you think that this universe is boundless in space and endless in time, and that only the earth can have life, it is like sowing countless seeds on the endless fertile farmland, but it is not enough. It is believed that only one seed can germinate and grow. It has been heard from time to time whether aliens from space have ever visited or are currently visiting the earth. Unfortunately, aliens are also like ghosts.

In 1864, in a village in southern France, a meteorite fell from the sky, and researchers found organic substances such as porphyrine, adenine and guanine, which showed that life is not alone, and she is also happening in the on other planets.In 1983, Wuxi, China obtained a large piece of meteorite, more than 50 centimeters in diameter, which also contains amino acid compounds, which are the seeds of life. If these seeds of life fall into one of the 100 billion environments suitable for life in the Milky Way just mentioned, they can germinate into various forms of life, so life can definitely occur in places other than the earth.

Through astronomical telescopes, no matter how far we look, we can always see things of the same type, such as stars, red giants, neutron stars, galaxies, star clusters, and nebulae. The structure of the universe is stable and uniform. It happens there too, so life on Earth should not be a rare and isolated exception, but a widespread natural phenomenon of the universe. Moreover, this is still inferred from our perspective. There may be some forms of life that we cannot imagine, and they can thrive without the conditions of life we ​​know.