Where did life on earth originate?

According to records, Aristotle may be the earliest explorer of the mystery of the origin of life. More than 3 years ago, he proposed that human life can occur naturally from inanimate matter, which is the famous theory of spontaneous life, which made many scholars believe that life can be produced directly and quickly from inanimate matter or other organisms. This view dominated the biological world for more than 1 years. Until the 13th century, people believed that sheep could grow from trees. At the beginning of 17th century, Belgian doctor Van Hellmont also suggested that mice could be born by mixed fermentation of sweat-soaked shirts and wheat.

in the mid-17th century, Italian doctor Reddy discovered by experiment that flies and other organisms were not naturally produced, but were born by their parents, thus denying the theory of autogenesis and establishing the theory of origin, believing that all organisms came from the same kind of organisms. However, the autonomists still insist on the original view that although flies can't occur naturally, simple organisms such as microorganisms can occur naturally. It was not until 1864, when the famous aseptic immersion experiment and goose neck bottle experiment by French chemist and microbiologist Pasteur came out, which confirmed the view that microorganisms could not naturally occur, that the theory of autogenesis was completely denied and the theory of biogenesis was established. But where did the first life on earth come from? This question is reminiscent of the old joke that the chicken and the egg compete. The theory of autogenesis and the theory of origin are also a question of whether the chicken comes first or the egg comes first.

in the late 19th century, some scholars put forward the hypothesis that life came from the universe. It is believed that life on earth is formed by the embryo of life in space falling to the surface. It was later discovered that ultraviolet rays and cosmic rays in the sun have strong lethality to kill life, which made people abandon their trust in this theory. At the beginning of the 2th century, there appeared the chemical origin theory that life originated from the primitive surface ocean. Its founder was the former Soviet biochemist Obalin, who published many monographs to prove this theory and expounded the chemical evolution of life from inorganic to organic and from simple to complex. Miller, an American scholar, successfully synthesized a variety of organic molecules such as amino acids from inorganic substances and simple organic substances in the laboratory in 1953, and later synthesized complex living polymers one after another. All these provide new evidence for the theory of chemical origin, which makes many people accept this view without doubt.

in the 196s, Keynes Smith, a chemist at the University of Glasgow in Scotland, put forward a new theory of origin-the theory of soil, which believed that life was produced by fine soil with special structure. Recently, NASA scientists have also discovered that the energy contained in ordinary soil can make inorganic substances synthesize organic substances, and even the basic organic substances necessary for life. This discovery is undoubtedly a strong support for the theory of soil, and it also explains the dehydration problem when small life molecules like amino acids synthesize life polymers like protein. It should be said that this theory is a big step forward from the viewpoint of chemical origin.

since the 196s, the application of radio astronomy technology has enabled scientists to discover a large number of organic molecules in space, especially in and near large nebulae, which has triggered people to rethink the theory of cosmic life. Around 198, Huo Yier, a British astronomer, put forward the idea of life in the new universe. In his book "The Wisdom Universe", he proposed that there are not only embryonic species of life in space, but also that life on earth may be related to cosmic intelligent creatures, further emphasizing the role of extraterrestrial life in the formation of life on earth.